Background
Methods
Data
Characteristic | 2009 | 2015/16 | Difference | |||
---|---|---|---|---|---|---|
n | % or mean (95% CI) | n | % or mean (95% CI) | [percentage points (95% CI), absolute difference] | ||
Total households | Sum | 1982 | 100 | 1800 | 100 | |
Household age composition | Adults only | 519 | 26.2 (24.1 to 28.3) | 506 | 28.1 (25.6 to 30.6) | 1.9 (−1.3 to 5.2) |
Adults & children | 1463 | 73.8 (71.7 to 75.9) | 1294 | 71.9 (69.4 to 74.4) | ||
Mean age (years) | 29.4 (28.7 to 30.1) | 31.6 (30.5 to 32.7) | 2.2 (0.9 to 3.5) | |||
Mean equivalised household income by income tertile | Lowest tertile (T$) | 665 | 3739 (3595 to 3883) | 523 | 4168 (4041 to 4295) | 428 (237 to 620) |
Middle tertile (T$) | 650 | 8358 (8231 to 8485) | 637 | 8808 (8646 to 8970) | 450 (244 to 656) | |
Highest tertile (T$) | 668 | 21,704 (20,286 to 23,122) | 639 | 21,906 (19,734 to 24,078) | 202 (− 2392 to 2796) | |
Main drinking water source | Bottled water | 39 | 2.0 (1.2 to 2.7) | 144 | 8.0 (5.7 to 10.3) | 6.0 (3.6 to 8.5) |
Tank/other | 1943 | 98.0 (97.3 to 98.8) | 1656 | 92.0 (89.7 to 94.3) | ||
Island | Tongatapu (main island) | 1367 | 69.0 (68.7 to 69.3) | 1292 | 71.8 (70.4 to 73.1) | 2.8 (1.4 to 4.1) |
Outer island/s | 615 | 31.0 (30.7 to 31.3) | 508 | 28.2 (26.9 to 29.6) | ||
Household size | Mean persons per household | 5.2 (5.0 to 5.4) | 5.7 (5.5 to 5.9) | 0.5 (0.2 to 0.7) | ||
Annual quarter | Oct-Dec | 474 | 23.9 (17.3 to 30.5) | 595 | 33.1 (24.2 to 41.9) | 9.2 (−1.9 to 20.2) |
Jan-Mar | 491 | 24.7 (18.0 to 31.5) | 315 | 17.5 (10.5 to 24.5) | −7.3 (− 17.0 to 2.5) | |
Apr-Jun | 529 | 26.7 (19.9 to 33.5) | 427 | 23.7 (16.2 to 31.2) | −3.0 (−13.2 to 7.1) | |
Jul-Sepa | 488 | 24.6 (17.9 to 31.4) | 460 | 25.5 (17.5 to 33.6) | 0.9 (−9.6 to 11.4) | |
Missing | 4 | 0.2 (0.0 to 0.4) | ||||
Household adult obesity | All adults obese | – | – | 579 | 32.2 (28.9 to 35.5) | |
Mixed | – | – | 1006 | 55.9 (52.9 to 58.9) | ||
No adults obese | – | – | 207 | 11.5 (9.5 to 13.6) | ||
Missing | – | – | 8 | 0.4 (0.1 to 0.8) | ||
Mean BMI (kg/m2) | – | 32.3 (31.9 to 32.6) |
Outcomes
Analysis
Results
Changes in expenditure outcomes
Outcome | 2009 (95% CIs) | 2015/16 (95% CIs) | Absolute difference (t-test 95% CIs) | % change (95% CI) | p-value | |
---|---|---|---|---|---|---|
Purchasing prevalence (% households) | All beverages | 72.3 (69.6 to 74.9) | 80.9 (78.4 to 83.3) | 8.6 (5.0 to 12.2) | 11.9 (6.6 to 17.3) | < 0.001 |
Soft drinks | 51.3 (48.3 to 54.3) | 40.4 (37.3 to 43.5) | −10.9 (− 15.2 to −6.5) | −21.2 (−28.7 to − 13.4) | < 0.001 | |
Milk | 29.9 (27.3 to 32.4) | 44.5 (40.7 to 48.4) | 14.6 (10.0 to 19.3) | 49.0 (31.3 to 67.8) | < 0.001 | |
Bottled water | 10.4 (8.7 to 12.1) | 35.0 (31.5 to 38.4) | 24.6 (20.7 to 28.4) | 236.5 (176.3 to 306.0) | < 0.001 | |
Mean expenditure (2015/16 T$ /person/year) | All beverages | 83.8 (73.6 to 94.0) | 116.0 (100.6 to 131.4) | 32.2 (13.7 to 50.7) | 38.4 (14.4 to 64.5) | 0.001 |
Soft drinks | 37.9 (31.1 to 44.7) | 29.6 (22.5 to 36.8) | −8.2 (−18.1 to 1.6) | −21.8 (−44.1 to 3.2) | 0.102 | |
Milk | 22.7 (19.7 to 25.8) | 35.4 (28.7 to 42.2) | 12.7 (5.2 to 20.1) | 55.7 (20.6 to 93.6) | 0.001 | |
Bottled water | 6.0 (3.4 to 8.6) | 26.6 (20.9 to 32.3) | 20.5 (14.3 to 26.8) | 341.1 (155.7 to 621.0) | < 0.001 | |
All food and beverages | 2500 (2310 to 2680) | 2150 (2020 to 2280) | − 344 (− 573 to − 115) | −13.8 (−21.9 to − 5.2) | 0.003 | |
Beverage expenditure as a proportion of household food budget (%) | All | 3.20 (2.94 to 3.45) | 5.41 (4.61 to 6.21) | 2.22 (1.38 to 3.06) | 69.4 (41.5 to 98.3) | < 0.001 |
Soft drinks | 1.39 (1.24 to 1.55) | 1.32 (1.07 to 1.58) | −0.07 (−0.37 to 0.22) | −5.2 (−25.7 to 16.5) | 0.633 | |
Milk | 0.87 (0.77 to 0.97) | 1.68 (1.44 to 1.93) | 0.82 (0.55 to 1.08) | 94.2 (59.4 to 131.7) | < 0.001 | |
Bottled water | 0.21 (0.14 to 0.28) | 1.31 (0.78 to 1.85) | 1.11 (0.56 to 1.65) | 532.5 (230.7 to 906.0) | < 0.001 | |
Beverage expenditure per person as a proportion of equivalised income (%) | All | 0.87 (0.75 to 1.00) | 1.20 (1.02 to 1.39) | 0.33 (0.11 to 0.56) | 38.3 (10.5 to 69.0) | 0.004 |
Soft drinks | 0.39 (0.33 to 0.45) | 0.32 (0.23 to 0.42) | −0.07 (−0.18 to 0.05) | − 17.0 (−44.5 to 12.8) | 0.267 | |
Milk | 0.23 (0.19 to 0.27) | 0.33 (0.28 to 0.38) | 0.10 (0.04 to 0.17) | 43.2 (12.0 to 79.1) | 0.002 | |
Water | 0.07 (0.00 to 0.13) | 0.23 (0.18 to 0.29) | 0.16 (0.08 to 0.25) | 234.3 (−63.5 to 1072.1) | < 0.001 | |
Estimated quantity of beverages acquired (kg/person/year) | All | 56.1 (46.6 to 65.5) | ||||
Soft drinks | 10.2 (7.9 to 12.4) | |||||
Milk | 10.3 (8.3 to 12.2) | |||||
Bottled water | 27.5 (20.7 to 34.4) |
Changes in expenditure by household income, household composition and island
Characteristic | Purchasing prevalence (% households) | ||||||
---|---|---|---|---|---|---|---|
2009 | 2015/16 | Absolute difference | Relative change (%) | Diff. p-value | |||
Soft drinks (taxed in 2013) | Total | All | 51.3 (48.3 to 54.3) | 40.4 (37.3 to 43.5) | −10.9 (−15.2 to −6.5) | −21.2 (−28.7 to − 13.4) | < 0.001 |
Age | Adults only | 45.8 (41.3 to 50.4) | 34.4 (28.2 to 40.6) | −11.4 (−19.1 to −3.7) | −24.9 (−40.1 to −9.0) | 0.004 | |
Adults and children | 53.2 (49.7 to 56.7) | 42.8 (39.1 to 46.4) | −10.5 (−15.5 to −5.4) | −19.6 (−28.1 to − 10.8) | < 0.001 | ||
p-value | 0.835 | ||||||
Income tertile | Lowest | 46.9 (42.0 to 51.7) | 32.6 (27.2 to 38.0) | −14.3 (−21.5 to −7.0) | −30.4 (−43.6 to − 16.5) | < 0.001 | |
Middle | 51.0 (46.8 to 55.1) | 45.5 (40.7 to 50.2) | −5.5 (−11.9 to 0.8) | − 10.8 (−22.4 to 1.3) | 0.087 | ||
Highest | 56.0 (51.6 to 60.3) | 41.8 (37.1 to 46.5) | −14.1 (−20.6 to −7.7) | −25.3 (−35.3 to − 14.8) | < 0.001 | ||
p-value | 0.980 | ||||||
Island | Outer islands | 35.1 (30.7 to 39.5) | 23.1 (18.5 to 27.7) | −12.0 (−18.3 to −5.6) | −34.1 (−49.1 to − 18.0) | < 0.001 | |
Tongatapu (main island) | 58.6 (54.7 to 62.4) | 47.2 (43.3 to 51.2) | −11.3 (−16.9 to −5.8) | −19.4 (−27.8 to −10.6) | < 0.001 | ||
p-value | 0.886 | ||||||
Milk | Total | All | 29.9 (27.3 to 32.4) | 44.5 (40.7 to 48.4) | 14.6 (10.0 to 19.3) | 49.0 (31.3 to 67.8) | < 0.001 |
Age | Adults only | 26.3 (22.1 to 30.4) | 39.7 (33.8 to 45.7) | 13.4 (6.2 to 20.7) | 51.2 (19.9 to 86.4) | < 0.001 | |
Adults and children | 31.1 (28.0 to 34.3) | 46.4 (42.1 to 50.7) | 15.2 (9.9 to 20.5) | 48.9 (29.3 to 70.0) | < 0.001 | ||
p-value | 0.698 | ||||||
Income tertile | Lowest | 22.9 (19.5 to 26.3) | 36.2 (30.6 to 41.9) | 13.3 (6.7 to 19.9) | 58.0 (25.7 to 93.9) | < 0.001 | |
Middle | 30.9 (26.7 to 35.1) | 46.0 (40.5 to 51.4) | 15.0 (8.2 to 21.9) | 48.6 (23.2 to 76.9) | < 0.001 | ||
Highest | 35.8 (32.1 to 39.5) | 49.6 (43.4 to 55.8) | 13.8 (6.6 to 21.1) | 38.7 (16.9 to 62.1) | < 0.001 | ||
p-value | 0.913 | ||||||
Island | Outer islands | 18.8 (15.1 to 22.5) | 27.3 (23.2 to 31.3) | 8.5 (2.9 to 14.0) | 44.9 (11.5 to 84.2) | 0.003 | |
Tongatapu (main island) | 34.8 (31.5 to 38.2) | 51.3 (46.3 to 56.3) | 16.4 (10.4 to 22.5) | 47.2 (27.7 to 68.1) | < 0.001 | ||
p-value | 0.055 | ||||||
Bottled water | Total | All | 10.4 (8.7 to 12.1) | 35.0 (31.5 to 38.4) | 24.6 (20.7 to 28.4) | 236.5 (176.3 to 306.0) | < 0.001 |
Age | Adults only | 9.4 (6.8 to 12.0) | 31.9 (25.5 to 38.2) | 22.5 (15.7 to 29.4) | 240 (135 to 375) | < 0.001 | |
Adults and children | 10.8 (8.7 to 12.8) | 36.2 (32.6 to 39.8) | 25.4 (21.3 to 29.5) | 236 (169 to 316) | < 0.001 | ||
p-value | 0.477 | ||||||
Income tertile | Lowest | 6.2 (4.1 to 8.3) | 28.4 (23.5 to 33.2) | 22.1 (16.8 to 27.4) | 355 (203 to 563) | < 0.001 | |
Middle | 9.7 (6.7 to 12.6) | 33.5 (28.5 to 38.5) | 23.8 (18.0 to 29.6) | 246 (141 to 385) | < 0.001 | ||
Highest | 15.3 (12.1 to 18.4) | 41.5 (36.1 to 47.0) | 26.3 (20.0 to 32.6) | 172 (111 to 246) | < 0.001 | ||
p-value | 0.324 | ||||||
Island | Outer islands | 2.0 (1.0 to 3.1) | 19.3 (15.6 to 23.0) | 17.2 (13.4 to 21.1) | 849 (399 to 1606) | < 0.001 | |
Tongatapu (main island) | 14.2 (11.7 to 16.6) | 41.2 (36.7 to 45.7) | 27.0 (21.9 to 32.1) | 191 (136 to 255) | < 0.001 | ||
p-value | 0.003 |
Characteristic | Mean expenditure (2015/2016 T$/person/year) | ||||||
---|---|---|---|---|---|---|---|
2009 | 2015/16 | Absolute difference | Relative change (%) | Diff. p-value | |||
Soft drinks (taxed in 2013) | Total | All | 37.9 (31.1 to 44.7) | 29.6 (22.5 to 36.8) | −8.2 (−18.1 to 1.6) | −21.8 (− 44.1 to 3.2) | 0.102 |
Age | Adults only | 67.1 (43.9 to 90.3) | 47.5 (26.2 to 68.8) | −19.7 (−51.2 to 11.8) | −29.3 (− 65.7 to 16.3) | 0.221 | |
Adults and children | 27.5 (24.0 to 31.0) | 22.7 (18.4 to 26.9) | −4.8 (−10.4 to 0.7) | −17.6 (−35.7 to 1.9) | 0.087 | ||
p-value | 0.364 | ||||||
Income tertile | Lowest | 18.5 (14.5 to 22.5) | 11.6 (7.1 to 16.1) | −6.9 (−12.9 to − 0.9) | −37.3 (− 63.6 to −7.9) | 0.024 | |
Middle | 27.1 (23.0 to 31.2) | 28.1 (17.0 to 39.2) | 1.0 (−10.8 to 12.8) | 3.6 (−39.0 to 48.8) | 0.870 | ||
Highest | 68.0 (49.0 to 87.0) | 45.2 (30.9 to 59.5) | −22.8 (−46.6 to 1.0) | −33.6 (−59.4 to − 2.2) | 0.060 | ||
p-value | 0.203 | ||||||
Island | Outer islands | 16.4 (12.7 to 20.1) | 12.5 (8.8 to 16.2) | −3.9 (−9.2 to 1.4) | −23.8 (−50.6 to 7.1) | 0.147 | |
Tongatapu (main island) | 47.6 (37.8 to 57.3) | 36.4 (26.5 to 46.3) | −11.2 (−25.0 to 2.7) | −23.5 (−48.0 to 4.4) | 0.114 | ||
p-value | 0.337 | ||||||
Milk | Total | All | 22.7 (19.7 to 25.8) | 35.4 (28.7 to 42.2) | 12.7 (5.2 to 20.1) | 55.7 (20.6 to 93.6) | 0.001 |
Age | Adults only | 32.4 (24.4 to 40.3) | 56.4 (39.2 to 73.5) | 24.0 (5.1 to 42.9) | 74.0 (10.7 to 148.4) | 0.013 | |
Adults and children | 19.3 (16.4 to 22.2) | 27.2 (22.4 to 32.0) | 7.9 (2.3 to 13.5) | 40.8 (9.8 to 75.1) | 0.006 | ||
p-value | 0.110 | ||||||
Income tertile | Lowest | 10.8 (8.1 to 13.5) | 13.9 (10.2 to 17.5) | 3.0 (−1.5 to 7.6) | 28.2 (− 15.3 to 80.5) | 0.193 | |
Middle | 17.5 (14.1 to 21.0) | 28.1 (21.5 to 34.6) | 10.5 (3.1 to 18.0) | 59.9 (13.7 to 112.8) | 0.006 | ||
Highest | 39.9 (32.2 to 47.5) | 59.0 (43.2 to 74.8) | 19.2 (1.6 to 36.7) | 48.1 (1.8 to 100.0) | 0.032 | ||
p-value | 0.082 | ||||||
Island | Outer islands | 12.7 (8.6 to 16.8) | 16.9 (12.6 to 21.2) | 4.1 (−1.8 to 10.1) | 32.5 (− 16.3 to 96.0) | 0.171 | |
Tongatapu (main island) | 27.3 (23.2 to 31.3) | 42.7 (33.6 to 51.8) | 15.5 (5.5 to 25.4) | 56.7 (17.6 to 99.4) | 0.002 | ||
p-value | 0.056 | ||||||
Bottled water | Total | All | 6.0 (3.4 to 8.6) | 26.6 (20.9 to 32.3) | 20.5 (14.3 to 26.8) | 341.1 (155.7 to 621.0) | < 0.001 |
Age | Adults only | 12.3 (3.5 to 21.2) | 42.8 (29.5 to 56.0) | 30.4 (14.5 to 46.4) | 247 (18 to 721) | < 0.001 | |
Adults and children | 3.8 (2.7 to 4.8) | 20.2 (15.5 to 25.0) | 16.4 (11.6 to 21.3) | 435 (257 to 658) | < 0.001 | ||
p-value | 0.100 | ||||||
Income tertile | Lowest | 4.7 (−1.6 to 11.1) | 10.4 (6.8 to 14.1) | 5.7 (−1.6 to 13.0) | 121 (− 964 to 6401) | 0.126 | |
Middle | 3.3 (1.4 to 5.3) | 17.8 (12.4 to 23.2) | 14.4 (8.7 to 20.2) | 433 (134 to 963) | < 0.001 | ||
Highest | 10.0 (6.1 to 13.9) | 47.3 (35.8 to 58.8) | 37.3 (25.1 to 49.4) | 373 (182 to 645) | < 0.001 | ||
p-value | < 0.001 | ||||||
Island | Outer islands | 0.4 (0.2 to 0.6) | 13.8 (8.9 to 18.8) | 13.5 (8.5 to 18.5) | 3678 (1530 to 7300) | < 0.001 | |
Tongatapu (main island) | 8.6 (4.8 to 12.4) | 31.6 (23.9 to 39.2) | 23.0 (14.5 to 31.5) | 269 (107 to 512) | < 0.001 | ||
p-value | 0.059 |
Characteristic | Beverage expenditures as a proportion of food and non-alcoholic beverages expenditure (%) | ||||||
---|---|---|---|---|---|---|---|
2009 | 2015/16 | Absolute difference | Relative change (%) | Diff. p-value | |||
Soft drinks (taxed in 2013) | Total | All | 1.39 (1.24 to 1.55) | 1.32 (1.07 to 1.58) | −0.07 (− 0.37 to 0.22) | −5.2 (− 25.7 to 16.5) | 0.633 |
Age | Adults only | 1.86 (1.43 to 2.29) | 1.58 (0.89 to 2.27) | −0.28 (− 1.10 to 0.53) | −15.2 (− 55.1 to 29.5) | 0.497 | |
Adults and children | 1.23 (1.10 to 1.36) | 1.22 (1.02 to 1.42) | −0.01 (− 0.24 to 0.23) | −0.6 (− 19.4 to 19.3) | 0.953 | ||
p-value | 0.525 | ||||||
Income tertile | Lowest | 1.09 (0.88 to 1.29) | 0.80 (0.60 to 0.99) | −0.29 (− 0.57 to − 0.01) | − 26.7 (− 47.8 to − 3.0) | 0.041 | |
Middle | 1.27 (1.05 to 1.49) | 1.35 (1.02 to 1.67) | 0.08 (− 0.31 to 0.47) | 6.4 (−23.7 to 39.8) | 0.687 | ||
Highest | 1.83 (1.49 to 2.17) | 1.71 (1.12 to 2.30) | −0.12 (− 0.80 to 0.56) | −6.6 (− 41.7 to 31.8) | 0.727 | ||
p-value | 0.652 | ||||||
Island | Outer islands | 0.61 (0.49 to 0.72) | 0.46 (0.35 to 0.57) | −0.14 (− 0.30 to 0.01) | − 23.9 (− 45.7 to 0.7) | 0.073 | |
Tongatapu (main island) | 1.75 (1.53 to 1.97) | 1.66 (1.31 to 2.01) | −0.09 (− 0.50 to 0.33) | −5.1 (− 27.8 to 19.1) | 0.676 | ||
p-value | 0.804 | ||||||
Milk | Total | All | 0.87 (0.77 to 0.97) | 1.68 (1.44 to 1.93) | 0.82 (0.55 to 1.08) | 94.2 (59.4 to 131.7) | < 0.001 |
Age | Adults only | 0.81 (0.61 to 1.00) | 2.02 (1.45 to 2.59) | 1.21 (0.61 to 1.81) | 150.2 (64.1 to 251.4) | < 0.001 | |
Adults and children | 0.89 (0.77 to 1.01) | 1.55 (1.33 to 1.78) | 0.66 (0.41 to 0.92) | 74.7 (41.6 to 111.2) | < 0.001 | ||
p-value | 0.099 | ||||||
Income tertile | Lowest | 0.67 (0.51 to 0.82) | 1.09 (0.85 to 1.33) | 0.42 (0.14 to 0.71) | 63.4 (14.8 to 121.2) | 0.004 | |
Middle | 0.85 (0.68 to 1.03) | 1.58 (1.25 to 1.91) | 0.73 (0.35 to 1.10) | 85.1 (33.8 to 144.7) | < 0.001 | ||
Highest | 1.08 (0.89 to 1.26) | 2.24 (1.73 to 2.74) | 1.16 (0.62 to 1.70) | 107.8 (51.3 to 170.9) | < 0.001 | ||
p-value | 0.018 | ||||||
Island | Outer islands | 0.41 (0.30 to 0.53) | 0.83 (0.57 to 1.09) | 0.42 (0.14 to 0.70) | 100.8 (24.4 to 193.5) | 0.004 | |
Tongatapu (main island) | 1.07 (0.93 to 1.21) | 2.02 (1.70 to 2.34) | 0.95 (0.60 to 1.30) | 88.6 (51.5 to 128.7) | < 0.001 | ||
p-value | 0.020 | ||||||
Bottled water | Total | All | 0.21 (0.14 to 0.28) | 1.31 (0.78 to 1.85) | 1.11 (0.56 to 1.65) | 532.5 (230.7 to 906.0) | < 0.001 |
Age | Adults only | 0.25 (0.13 to 0.38) | 1.92 (0.45 to 3.39) | 1.66 (0.19 to 3.14) | 653 (49 to 1454) | 0.027 | |
Adults and children | 0.19 (0.12 to 0.26) | 1.08 (0.83 to 1.33) | 0.89 (0.62 to 1.15) | 464 (249 to 760) | < 0.001 | ||
p-value | 0.309 | ||||||
Income tertile | Lowest | 0.09 (0.05 to 0.14) | 0.73 (0.50 to 0.95) | 0.63 (0.40 to 0.86) | 665 (298 to 1218) | < 0.001 | |
Middle | 0.16 (0.06 to 0.26) | 0.96 (0.70 to 1.22) | 0.80 (0.52 to 1.08) | 507 (159 to 1155) | < 0.001 | ||
Highest | 0.37 (0.19 to 0.55) | 2.10 (0.87 to 3.33) | 1.73 (0.49 to 2.97) | 468 (91 to 997) | 0.006 | ||
p-value | 0.087 | ||||||
Island | Outer islands | 0.01 (0.01 to 0.02) | 0.44 (0.31 to 0.56) | 0.42 (0.30 to 0.55) | 2811 (1188 to 5724) | < 0.001 | |
Tongatapu (main island) | 0.29 (0.20 to 0.39) | 1.66 (0.92 to 2.40) | 1.37 (0.62 to 2.12) | 464 (177 to 817) | < 0.001 | ||
p-value | 0.015 |
Characteristic | Household beverage expenditure as a proportion of equivalised household income (%) | ||||||
---|---|---|---|---|---|---|---|
2009 | 2015/16 | Absolute difference | Relative change (%) | Diff. p-value | |||
Soft drinks (taxed in 2013) | Total | All | 0.39 (0.33 to 0.45) | 0.32 (0.23 to 0.42) | −0.07 (−0.18 to 0.05) | −17.0 (−44.5 to 12.8) | 0.267 |
Age | Adults only | 0.63 (0.43 to 0.82) | 0.51 (0.19 to 0.83) | −0.12 (− 0.49 to 0.26) | −18.6 (−72.1 to 43.5) | 0.544 | |
Adults and children | 0.31 (0.26 to 0.35) | 0.25 (0.20 to 0.30) | −0.05 (− 0.12 to 0.01) | − 18.0 (−36.9 to 2.9) | 0.103 | ||
p-value | 0.752 | ||||||
Income tertile | Lowest | 0.54 (0.39 to 0.70) | 0.51 (0.25 to 0.76) | −0.03 (− 0.33 to 0.26) | −6.3 (−56.6 to 52.0) | 0.821 | |
Middle | 0.34 (0.25 to 0.42) | 0.30 (0.17 to 0.42) | −0.04 (− 0.19 to 0.11) | −11.4 (−51.9 to 35.2) | 0.617 | ||
Highest | 0.29 (0.23 to 0.36) | 0.20 (0.16 to 0.24) | −0.09 (− 0.17 to − 0.02) | −31.5 (− 50.4 to −9.1) | 0.017 | ||
p-value | 0.712 | ||||||
Island | Outer islands | 0.19 (0.14 to 0.24) | 0.17 (0.11 to 0.23) | −0.02 (− 0.09 to 0.06) | −8.9 (−45.2 to 34.3) | 0.668 | |
Tongatapu (main island) | 0.48 (0.39 to 0.57) | 0.38 (0.25 to 0.52) | −0.10 (− 0.26 to 0.06) | −20.2 (−50.7 to 13.1) | 0.240 | ||
p-value | 0.379 | ||||||
Milk | Total | All | 0.23 (0.19 to 0.27) | 0.33 (0.28 to 0.38) | 0.10 (0.04 to 0.17) | 43.2 (12.0 to 79.1) | 0.002 |
Age | Adults only | 0.32 (0.19 to 0.46) | 0.43 (0.30 to 0.55) | 0.10 (−0.08 to 0.29) | 32.1 (−26.4 to 116.3) | 0.264 | |
Adults and children | 0.20 (0.17 to 0.23) | 0.30 (0.25 to 0.34) | 0.10 (0.04 to 0.15) | 47.9 (17.3 to 82.1) | 0.001 | ||
p-value | 0.937 | ||||||
Income tertile | Lowest | 0.33 (0.22 to 0.44) | 0.42 (0.31 to 0.54) | 0.10 (−0.06 to 0.25) | 28.9 (−19.6 to 92.3) | 0.229 | |
Middle | 0.20 (0.16 to 0.24) | 0.30 (0.23 to 0.37) | 0.10 (0.02 to 0.18) | 47.9 (5.1 to 97.6) | 0.018 | ||
Highest | 0.17 (0.14 to 0.20) | 0.29 (0.23 to 0.36) | 0.13 (0.05 to 0.20) | 75.7 (27.1 to 130.3) | 0.001 | ||
p-value | 0.716 | ||||||
Island | Outer islands | 0.14 (0.08 to 0.20) | 0.21 (0.17 to 0.25) | 0.07 (0.00 to 0.14) | 48.7 (−11.8 to 139.3) | 0.065 | |
Tongatapu (main island) | 0.27 (0.22 to 0.33) | 0.38 (0.31 to 0.45) | 0.11 (0.02 to 0.19) | 39.4 (5.2 to 79.2) | 0.014 | ||
p-value | 0.498 | ||||||
Bottled water | Total | All | 0.07 (0.00 to 0.13) | 0.23 (0.18 to 0.29) | 0.16 (0.08 to 0.25) | 234.3 (−63.5 to 1072.1) | < 0.001 |
Age | Adults only | 0.16 (−0.08 to 0.40) | 0.29 (0.18 to 0.41) | 0.13 (− 0.14 to 0.40) | 80 (644 to − 4542) | 0.336 | |
Adults and children | 0.04 (0.03 to 0.05) | 0.21 (0.16 to 0.25) | 0.17 (0.12 to 0.22) | 479 (284 to 723) | < 0.001 | ||
p-value | 0.775 | ||||||
Income tertile | Lowest | 0.13 (−0.06 to 0.32) | 0.23 (0.15 to 0.32) | 0.11 (−0.10 to 0.31) | 83 (666 to − 4527) | 0.311 | |
Middle | 0.03 (0.02 to 0.05) | 0.23 (0.12 to 0.35) | 0.20 (0.09 to 0.31) | 603 (200 to 1166) | < 0.001 | ||
Highest | 0.05 (0.03 to 0.06) | 0.22 (0.17 to 0.28) | 0.18 (0.12 to 0.23) | 397 (217 to 637) | < 0.001 | ||
p-value | 0.495 | ||||||
Island | Outer islands | 0.01 (0.00 to 0.01) | 0.13 (0.09 to 0.16) | 0.12 (0.08 to 0.16) | 1962 (− 282 to 9346) | < 0.001 | |
Tongatapu (main island) | 0.10 (0.00 to 0.19) | 0.27 (0.20 to 0.35) | 0.17 (0.05 to 0.29) | 179 (−81 to 939) | 0.004 | ||
p-value | 0.397 |