Background
Methods
Results
Characteristics of the schoolchildren
Measurement | Total (n = 199) | Boys (n = 93) | Girls (n = 106) |
p-value
*
| |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Median | IQR | Min | Max | Median | IQR | Min | Max | Median | IQR | Min | Max | ||
Age years | 8.5 | 7.0–9.5 | 5.5 | 11.0 | 8.0 | 7.0–9.0 | 5.5 | 11.0 | 8.5 | 7.0–9.5 | 5.5 | 11.0 |
0.267
|
Weight kg | 29.0 | 24.0–36.2 | 14.0 | 80.5 | 28.5 | 24.1–38.8 | 16.5 | 80.5 | 29.2 | 23.0–35.6 | 14.0 | 71.0 |
0.688
|
Height cm | 128.0 | 121.0–135.0 | 29.3 | 158.5 | 128.0 | 120.3–133.0 | 29.3 | 153.0 | 128.5 | 121.9–135.1 | 99.0 | 158.5 |
0.326
|
BMI kg/cm2 | 17.7 | 15.6–21.0 | 12.7 | 36.3 | 18.1 | 15.9–21.7 | 12.9 | 36.3 | 17.7 | 15.4–19.8 | 12.7 | 31.7 |
0.212
|
Head circumference cm | 53.0 | 52.0–54.0 | 35.0 | 58.0 | 53.0 | 52.0–54.0 | 35.0 | 58.0 | 53.0 | 51.0–54.0 | 49.0 | 58.0 |
0.108
|
Wrist cm | 14.0 | 13.0–15.0 | 11.0 | 40.0 | 14.0 | 13.0–15.0 | 11.0 | 40.0 | 13.8 | 13.0–14.5 | 11.0 | 17.0 |
0.001
|
Variable | Catagories | Total (n = 199) | Boys (n = 93) | Girls (n = 106) | |||
---|---|---|---|---|---|---|---|
n | % | n | % | n | % | ||
Governorate | Asma | 45 |
22.6
| 17 |
18.3
| 28 |
26.4
|
Hawalli | 26 |
13.1
| 10 |
10.8
| 16 |
15.1
| |
Farwania | 29 |
14.6
| 19 |
20.4
| 10 |
9.4
| |
Mubarak Al-Kabir | 41 |
20.6
| 27 |
29.0
| 14 |
13.2
| |
Ahmedi | 33 |
16.6
| 9 |
9.7
| 24 |
22.6
| |
Jahara | 25 |
12.6
| 11 |
11.8
| 14 |
13.2
| |
Age years | 5.5–6.49 | 10 |
5.0
| 5 |
5.4
| 5 |
4.7
|
6.5–7.49 | 41 |
20.6
| 19 |
20.4
| 22 |
20.8
| |
7.5–8.49 | 45 |
22.6
| 25 |
26.9
| 20 |
18.9
| |
8.5–9.49 | 52 |
26.1
| 25 |
26.9
| 27 |
25.5
| |
9.5–10.49 | 38 |
19.1
| 13 |
14.0
| 25 |
23.6
| |
10.5–11.0 | 13 |
6.5
| 6 |
6.5
| 7 |
6.6
| |
Obesity index | non | 113.0 |
56.8
| 49.0 |
52.7
| 64.0 |
60.4
|
overweight | 49.0 |
24.6
| 22.0 |
23.7
| 27.0 |
25.5
| |
obese | 37.0 |
18.6
| 22.0 |
23.7
| 15.0 |
14.2
| |
Skin color | light | 65 |
32.7
| 25 |
26.9
| 40 |
37.7
|
medium | 117 |
58.8
| 57 |
61.3
| 60 |
56.6
| |
dark | 17 |
8.5
| 11 |
11.8
| 6 |
5.7
| |
Sun exposure | up to 5 min | 99 |
49.70
| 41 |
44.1
| 58 |
54.7
|
up to 15 min | 40 |
20.10
| 16 |
17.2
| 24 |
22.6
| |
up to 30 min | 60 |
30.20
| 36 |
38.7
| 24 |
22.6
| |
Physical activity | rarely | 41 |
20.60
| 12 |
12.9
| 29 |
27.4
|
weekly | 53 |
26.60
| 27 |
26.6
| 26 |
24.5
| |
daily | 105 |
52.80
| 54 |
58.1
| 51 |
48.1
|
25(OH)D and associations
Measurement* | Total (n = 199) | Boys (n = 93) | Girls (n = 106) |
P-value
| |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Median | IQR | Min | Max | Median | IQR | Min | Max | Median | IQR | Min | Max | ||
25(OH)D nmol/L | 30.0 | 22.0–39.0 | 5.0 | 89.0 | 34.0 | 27.0–47.0 | 12.0 | 89.0 | 27.0 | 18.0–35.0 | 5.0 | 71.0 |
0.001
|
PTH pmol/L | 4.70 | 3.80–5.90 | 1.90 | 20.70 | 4.20 | 3.55–5.40 | 1.90 | 9.00 | 5.20 | 4.08–6.33 | 2.00 | 20.70 |
0.001
|
Calcium mmol/L | 2.47 | 2.39–2.52 | 1.43 | 2.71 | 2.45 | 2.36–2.53 | 2.09 | 2.70 | 2.47 | 2.40–2.52 | 1.43 | 2.71 |
0.245
|
Adj Calcium mmol/L | 2.39 | 2.33–2.44 | 2.14 | 2.59 | 2.39 | 2.33–2.45 | 2.14 | 2.58 | 2.39 | 2.34–2.44 | 2.17 | 2.59 |
0.749
|
Variable | Catagories | Total (n = 199) | Boys (n = 93) | Girls (n = 106) | |||
---|---|---|---|---|---|---|---|
Mean rank |
p-value
| Mean rank |
p-value
| Mean rank |
p-value
| ||
Governorate |
0.559
|
0.300
|
0.953
| ||||
Asma | 97.13 | 51.68 | 50.18 | ||||
Hawalli | 102.63 | 53.10 | 55.38 | ||||
Farwania | 93.76 | 35.03 | 56.80 | ||||
Mubarak Al-Kabir | 114.30 | 50.06 | 57.75 | ||||
Ahmedi | 90.59 | 53.72 | 50.58 | ||||
Jahara | 98.62 | 41.91 | 56.39 | ||||
Age years |
0.016
|
0.045
|
0.025
| ||||
5.5–6.49 | 136.65 | 73.50 | 67.60 | ||||
6.5–7.49 | 110.39 | 39.42 | 71.57 | ||||
7.5–8.49 | 112.98 | 55.60 | 52.83 | ||||
8.5–9.49 | 89.25 | 45.44 | 42.96 | ||||
9.5–10.49 | 80.57 | 35.58 | 48.54 | ||||
10.5–11.0 | 93.92 | 44.33 | 46.93 | ||||
Obesity index |
0.084
|
0.214
|
0.044
| ||||
non | 107.85 | 51.47 | 59.10 | ||||
overweight | 91.41 | 44.02 | 48.28 | ||||
obese | 87.42 | 40.02 | 39.00 | ||||
Skin color |
0.505
|
0.936
|
0.010
| ||||
light | 105.65 | 45.34 | 62.20 | ||||
medium | 98.51 | 47.68 | 50.62 | ||||
dark | 88.65 | 47.23 | 24.33 | ||||
Sun exposure |
0.618
|
0.465
|
0.663
| ||||
up to 5 min | 97.38 | 49.04 | 51.40 | ||||
up to 15 min | 97.34 | 39.47 | 58.13 | ||||
up to 30 min | 106.09 | 48.03 | 53.96 | ||||
Physical activity |
0.650
|
0.170
|
0.922
| ||||
rarely | 90.20 | 39.88 | 57.41 | ||||
weekly | 110.85 | 54.87 | 54.90 | ||||
daily | 98.35 | 44.65 | 52.26 |
Significant risk factors for deficient 25(OH)D
Independent variablesa
|
Odds ratio
| 95% C.I. |
P-value
| |
---|---|---|---|---|
Lower | Upper | |||
Age (<8.5 yrs. vs. older) |
4.954
| 1.926 | 12.742 |
.001
|
Gender (male vs. female) |
2.444
| 1.225 | 4.877 |
.011
|
PTH (<7 pmol/L vs. higher) |
2.282
| 1.166 | 4.464 |
.016
|
Overweight (& obese vs. normal) |
2.175
| 1.110 | 4.262 |
.024
|