Background
Methods
The Swedish birth register
Postnatal longitudinal growth study
Statistical analysis
Body size at birth
Body size at birth to final height
Curve fitting of the mean and SD values
Results
Sample selection
Obtaining reference values
Total | Adjusted | Delta = 1.0 | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
GA | Mean | SD | SKEW | KURT | Mean | SD | SKEW | KURT | Mean | SD | SKEW | KURT |
Boys
| ||||||||||||
24 | 32.19 | 1.69 | 0.24 | -0.61 | -0.56 | 1.77 | 0.26 | -0.20 | -0.71 | 1.88 | 0.14 | 0.05 |
25 | 33.78 | 1.88 | 0.00 | 0.51 | -0.64 | 1.81 | -0.06 | 0.23 | -0.65 | 1.50 | -0.30 | 0.41 |
26 | 34.77 | 2.31 | -1.75 | 5.78 | -1.39 | 2.22 | -1.81 | 5.91 | -1.19 | 1.76 | -0.08 | -0.09 |
24–26
|
33.94
|
2.24
|
-0.64
|
1.52
|
-0.96
|
2.02
|
-1.15
|
4.68
|
-0.88
|
1.68
|
-0.22
|
0.09
|
27 | 37.07 | 3.50 | 1.86 | 5.53 | -0.52 | 3.46 | 2.06 | 6.51 | -0.97 | 2.13 | 0.01 | -0.05 |
28 | 38.08 | 2.73 | -0.35 | 3.22 | -0.97 | 2.70 | -0.26 | 3.14 | -0.86 | 1.91 | -0.46 | 0.71 |
29 | 39.87 | 3.45 | 0.02 | 3.79 | -0.60 | 3.45 | 0.04 | 3.82 | -0.55 | 2.17 | -0.11 | 0.09 |
27–29
|
38.46
|
3.44
|
0.55
|
2.74
|
-0.70
|
3.22
|
0.74
|
5.06
|
-0.76
|
2.07
|
-0.15
|
0.17
|
30 | 41.32 | 2.81 | 0.45 | 3.18 | -0.49 | 2.78 | 0.49 | 3.11 | -0.55 | 2.24 | -0.16 | 0.18 |
31 | 42.38 | 2.70 | -0.12 | 2.11 | -0.65 | 2.69 | -0.13 | 2.09 | -0.57 | 2.32 | -0.14 | -0.02 |
32 | 43.85 | 2.56 | -0.56 | 3.12 | -0.36 | 2.54 | -0.51 | 3.15 | -0.30 | 2.18 | 0.02 | 0.04 |
33 | 45.07 | 2.29 | -0.43 | 2.43 | -0.27 | 2.26 | -0.43 | 2.48 | -0.21 | 2.11 | -0.09 | 0.02 |
34 | 46.21 | 2.19 | -0.34 | 1.62 | -0.20 | 2.17 | -0.37 | 1.85 | -0.15 | 1.96 | -0.06 | 0.05 |
35 | 47.07 | 2.10 | -0.29 | 1.53 | -0.36 | 2.08 | -0.28 | 1.52 | -0.31 | 1.94 | -0.07 | 0.03 |
36 | 47.96 | 2.02 | -0.16 | 0.62 | -0.45 | 2.00 | -0.16 | 0.62 | -0.41 | 1.93 | -0.03 | 0.08 |
37 | 48.90 | 2.01 | -0.18 | 0.81 | -0.48 | 1.99 | -0.19 | 0.84 | -0.44 | 1.89 | -0.12 | 0.05 |
38 | 49.80 | 1.92 | -0.09 | 0.74 | -0.49 | 1.91 | -0.09 | 0.76 | -0.48 | 1.80 | -0.05 | 0.19 |
39 | 50.58 | 1.85 | -0.05 | 0.70 | -0.57 | 1.84 | -0.05 | 0.71 | -0.57 | 1.74 | 0.05 | 0.04 |
40 | 51.28 | 1.84 | 0.04 | 0.41 | -0.68 | 1.83 | 0.04 | 0.41 | -0.70 | 1.79 | 0.09 | -0.06 |
41 | 51.89 | 1.87 | 0.02 | 0.41 | -0.87 | 1.86 | 0.02 | 0.42 | -0.84 | 1.88 | 0.00 | -0.05 |
42 | 52.40 | 1.91 | 0.00 | 0.35 | -1.00 | 1.90 | -0.03 | 0.65 | -1.00 | 1.92 | 0.13 | 0.18 |
Girls
| ||||||||||||
24 | 32.45 | 3.45 | 3.62 | 18.24 | -0.53 | 3.57 | 3.79 | 19.48 | -1.02 | 1.95 | -0.06 | -0.34 |
25 | 33.88 | 3.99 | 3.23 | 12.96 | -0.55 | 4.06 | 3.33 | 13.42 | -1.23 | 1.91 | 0.03 | 0.09 |
26 | 35.15 | 2.53 | 0.98 | 6.88 | -0.86 | 2.49 | 0.94 | 7.66 | -0.98 | 1.82 | 0.09 | 0.14 |
24–26
|
34.11
|
3.42
|
2.32
|
9.92
|
-0.69
|
3.29
|
3.18
|
16.26
|
-1.03
|
1.85
|
0.07
|
-0.13
|
27 | 36.60 | 4.16 | 1.73 | 4.74 | -0.73 | 4.13 | 1.77 | 5.00 | -1.11 | 2.57 | -0.20 | 1.00 |
28 | 37.50 | 2.75 | 0.34 | 2.57 | -1.34 | 2.69 | 0.27 | 2.51 | -1.35 | 2.35 | -0.18 | 0.08 |
29 | 39.57 | 2.55 | 0.88 | 5.35 | -0.66 | 2.49 | 0.88 | 5.28 | -0.68 | 2.03 | -0.49 | 0.43 |
27–29
|
38.19
|
3.31
|
0.68
|
3.05
|
-0.89
|
3.03
|
1.35
|
6.31
|
-0.96
|
2.25
|
-0.22
|
0.12
|
30 | 40.80 | 2.73 | 0.68 | 3.97 | -0.51 | 2.71 | 0.75 | 4.03 | -0.56 | 1.99 | -0.33 | 0.14 |
31 | 42.39 | 2.69 | 0.63 | 1.99 | -0.16 | 2.66 | 0.66 | 2.26 | -0.25 | 2.14 | -0.14 | -0.22 |
32 | 43.24 | 2.52 | -0.31 | 3.80 | -0.46 | 2.50 | -0.30 | 3.93 | -0.41 | 1.98 | -0.14 | 0.41 |
33 | 44.53 | 2.26 | -0.24 | 1.66 | -0.25 | 2.26 | -0.27 | 1.69 | -0.21 | 2.08 | -0.08 | 0.03 |
34 | 45.58 | 2.35 | -0.34 | 2.60 | -0.22 | 2.35 | -0.31 | 2.67 | -0.16 | 2.08 | -0.05 | -0.05 |
35 | 46.48 | 2.11 | -0.18 | 0.78 | -0.31 | 2.09 | -0.17 | 0.79 | -0.28 | 2.00 | 0.00 | -0.03 |
36 | 47.37 | 2.02 | -0.15 | 0.45 | -0.37 | 2.01 | -0.14 | 0.42 | -0.34 | 1.93 | -0.07 | -0.05 |
37 | 48.23 | 1.97 | -0.04 | 0.73 | -0.44 | 1.95 | -0.03 | 0.73 | -0.42 | 1.87 | 0.01 | -0.01 |
38 | 49.03 | 1.89 | -0.13 | 0.72 | -0.52 | 1.88 | -0.12 | 0.72 | -0.49 | 1.81 | -0.08 | 0.05 |
39 | 49.79 | 1.81 | -0.07 | 0.75 | -0.59 | 1.80 | -0.07 | 0.76 | -0.59 | 1.70 | -0.08 | 0.15 |
40 | 50.44 | 1.81 | -0.04 | 0.80 | -0.71 | 1.80 | -0.04 | 0.81 | -0.72 | 1.72 | 0.08 | 0.07 |
41 | 51.01 | 1.83 | 0.03 | 0.54 | -0.92 | 1.82 | 0.02 | 0.53 | -0.84 | 1.77 | 0.08 | 0.35 |
42 | 51.44 | 1.85 | 0.10 | 0.41 | -1.13 | 1.84 | 0.12 | 0.53 | -1.15 | 1.82 | 0.22 | 0.04 |
Total | Adjusted | Delta = 1.0 | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
GA | Mean | SD | SKEW | KURT | Mean | SD | SKEW | KURT | Mean | SD | SKEW | KURT |
Boys
| ||||||||||||
24 | -0.16 | 0.14 | -6.14 | 47.15 | -0.029 | 0.144 | -6.47 | 50.68 | -0.013 | 0.060 | 0.18 | 0.26 |
25 | -0.07 | 0.16 | 0.30 | 23.98 | -0.013 | 0.159 | 0.21 | 24.03 | -0.022 | 0.053 | -0.42 | 0.45 |
26 | -0.03 | 0.08 | -0.25 | 5.05 | -0.037 | 0.078 | -0.30 | 5.12 | -0.031 | 0.056 | 0.04 | 0.15 |
24–26
|
-0.07
|
0.14
|
-1.64
|
31.64
|
-0.026
|
0.128
|
-1.70
|
38.18
|
-0.024
|
0.055
|
-0.16
|
0.03
|
27 | 0.04 | 0.10 | 1.76 | 9.23 | -0.028 | 0.103 | 1.93 | 10.93 | -0.029 | 0.058 | -0.07 | 0.29 |
28 | 0.09 | 0.08 | -1.41 | 6.08 | -0.031 | 0.081 | -1.31 | 6.34 | -0.026 | 0.058 | -0.11 | 0.24 |
29 | 0.14 | 0.10 | -0.07 | 4.13 | -0.038 | 0.100 | -0.06 | 4.25 | -0.031 | 0.066 | -0.41 | 0.31 |
27–29
|
0.09
|
0.11
|
0.25
|
3.72
|
-0.033
|
0.095
|
0.47
|
7.72
|
-0.028
|
0.060
|
-0.21
|
0.25
|
30 | 0.19 | 0.10 | 0.11 | 3.63 | -0.036 | 0.094 | 0.20 | 3.90 | -0.033 | 0.064 | -0.06 | -0.11 |
31 | 0.24 | 0.09 | -0.61 | 4.16 | -0.036 | 0.088 | -0.64 | 4.16 | -0.030 | 0.063 | -0.32 | 0.38 |
32 | 0.30 | 0.08 | -0.28 | 3.58 | -0.023 | 0.080 | -0.25 | 3.73 | -0.021 | 0.062 | -0.12 | 0.00 |
33 | 0.35 | 0.07 | -0.44 | 4.25 | -0.015 | 0.074 | -0.39 | 4.41 | -0.013 | 0.057 | -0.19 | 0.19 |
34 | 0.39 | 0.07 | -0.52 | 2.94 | -0.010 | 0.070 | -0.54 | 3.23 | -0.008 | 0.057 | 0.00 | 0.10 |
35 | 0.43 | 0.07 | -0.58 | 2.33 | -0.008 | 0.065 | -0.58 | 2.35 | -0.005 | 0.056 | -0.10 | -0.01 |
36 | 0.46 | 0.06 | -0.42 | 1.29 | -0.006 | 0.063 | -0.43 | 1.33 | -0.004 | 0.057 | -0.10 | 0.02 |
37 | 0.50 | 0.06 | -0.37 | 1.16 | -0.004 | 0.060 | -0.37 | 1.16 | -0.002 | 0.054 | -0.05 | 0.04 |
38 | 0.53 | 0.06 | -0.30 | 0.83 | -0.004 | 0.056 | -0.29 | 0.84 | -0.002 | 0.053 | -0.07 | 0.03 |
39 | 0.55 | 0.05 | -0.27 | 0.68 | -0.006 | 0.053 | -0.26 | 0.68 | -0.005 | 0.051 | -0.05 | 0.02 |
40 | 0.57 | 0.05 | -0.21 | 0.45 | -0.011 | 0.052 | -0.21 | 0.46 | -0.010 | 0.050 | -0.04 | 0.02 |
41 | 0.58 | 0.05 | -0.24 | 0.42 | -0.019 | 0.052 | -0.25 | 0.44 | -0.014 | 0.051 | -0.06 | 0.02 |
42 | 0.59 | 0.05 | -0.27 | 0.39 | -0.024 | 0.052 | -0.22 | 0.40 | -0.023 | 0.052 | -0.06 | 0.00 |
Girls
| ||||||||||||
24 | -0.15 | 0.10 | 4.20 | 28.58 | -0.009 | 0.106 | 4.38 | 30.13 | -0.016 | 0.063 | -0.22 | -0.06 |
25 | -0.08 | 0.12 | 3.02 | 15.07 | -0.006 | 0.122 | 3.20 | 16.26 | -0.017 | 0.057 | 0.16 | 0.77 |
26 | -0.05 | 0.08 | -1.10 | 2.86 | -0.044 | 0.079 | -1.31 | 3.37 | -0.036 | 0.055 | -0.44 | 0.91 |
24–26
|
-0.09
|
0.11
|
1.92
|
11.18
|
-0.022
|
0.104
|
2.87
|
20.82
|
-0.024
|
0.057
|
0.02
|
0.20
|
27 | 0.02 | 0.14 | 1.75 | 5.95 | -0.026 | 0.138 | 1.88 | 6.73 | -0.035 | 0.073 | -0.36 | 0.23 |
28 | 0.05 | 0.10 | -0.67 | 1.53 | -0.065 | 0.095 | -0.73 | 2.21 | -0.055 | 0.077 | -0.32 | 0.55 |
29 | 0.13 | 0.08 | -0.84 | 4.46 | -0.040 | 0.083 | -0.91 | 5.12 | -0.034 | 0.064 | -0.12 | -0.04 |
27–29
|
0.07
|
0.11
|
0.23
|
3.05
|
-0.045
|
0.105
|
0.87
|
7.90
|
-0.040
|
0.070
|
-0.20
|
0.08
|
30 | 0.18 | 0.10 | 0.09 | 5.70 | -0.033 | 0.101 | 0.14 | 6.03 | -0.034 | 0.062 | -0.12 | 0.03 |
31 | 0.23 | 0.09 | 0.38 | 2.90 | -0.029 | 0.092 | 0.43 | 3.16 | -0.029 | 0.063 | -0.12 | 0.17 |
32 | 0.28 | 0.08 | -0.25 | 2.56 | -0.027 | 0.082 | -0.27 | 2.59 | -0.022 | 0.066 | -0.25 | 0.08 |
33 | 0.33 | 0.07 | -0.34 | 1.89 | -0.019 | 0.073 | -0.34 | 1.91 | -0.016 | 0.058 | -0.03 | 0.08 |
34 | 0.37 | 0.08 | -0.42 | 1.52 | -0.010 | 0.074 | -0.41 | 1.64 | -0.006 | 0.059 | -0.05 | 0.10 |
35 | 0.41 | 0.07 | -0.36 | 1.15 | -0.004 | 0.068 | -0.36 | 1.22 | -0.001 | 0.060 | -0.11 | 0.06 |
36 | 0.45 | 0.06 | -0.31 | 0.96 | 0.000 | 0.064 | -0.30 | 0.94 | 0.002 | 0.058 | -0.09 | 0.07 |
37 | 0.48 | 0.06 | -0.35 | 1.14 | 0.001 | 0.061 | -0.34 | 1.17 | 0.003 | 0.056 | -0.06 | 0.05 |
38 | 0.51 | 0.06 | -0.29 | 0.91 | 0.000 | 0.057 | -0.28 | 0.92 | 0.002 | 0.054 | -0.04 | 0.03 |
39 | 0.53 | 0.05 | -0.23 | 0.56 | -0.003 | 0.053 | -0.23 | 0.57 | -0.002 | 0.051 | -0.04 | 0.02 |
40 | 0.55 | 0.05 | -0.18 | 0.37 | -0.008 | 0.052 | -0.17 | 0.38 | -0.007 | 0.051 | -0.02 | 0.00 |
41 | 0.57 | 0.05 | -0.22 | 0.46 | -0.016 | 0.052 | -0.22 | 0.45 | -0.011 | 0.051 | -0.06 | 0.03 |
42 | 0.57 | 0.05 | -0.19 | 0.29 | -0.024 | 0.052 | -0.13 | 0.35 | -0.023 | 0.051 | -0.01 | 0.01 |
Total | Adjusted | Delta = 1.0 | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
GA | Mean | SD | SKEW | KURT | Mean | SD | SKEW | KURT | Mean | SD | SKEW | KURT |
Boys
| ||||||||||||
24 | 22.25 | 0.93 | -0.24 | 0.19 | -0.75 | 0.91 | -0.36 | 0.10 | -0.75 | 0.82 | 0.08 | -0.46 |
25 | 23.26 | 1.34 | 0.71 | 0.64 | -0.82 | 1.29 | 0.89 | 0.60 | -1.02 | 1.12 | 0.54 | 0.27 |
26 | 24.58 | 1.35 | -0.01 | -0.22 | -0.67 | 1.32 | 0.06 | -0.25 | -0.70 | 1.39 | 0.07 | -0.37 |
24–26
|
23.72
|
1.57
|
0.26
|
-0.43
|
-0.73
|
1.24
|
0.32
|
0.07
|
-0.79
|
1.21
|
0.20
|
-0.17
|
27 | 26.05 | 2.49 | 1.89 | 5.38 | -0.17 | 2.46 | 2.06 | 6.33 | -0.52 | 1.59 | 0.17 | 0.27 |
28 | 26.71 | 1.72 | 1.26 | 4.74 | -0.52 | 1.70 | 1.57 | 5.87 | -0.67 | 1.19 | -0.12 | 0.06 |
29 | 27.85 | 2.04 | 1.27 | 3.53 | -0.35 | 2.04 | 1.30 | 3.44 | -0.53 | 1.55 | 0.16 | -0.24 |
27–29
|
26.94
|
2.23
|
1.22
|
3.37
|
-0.35
|
2.08
|
1.79
|
6.02
|
-0.57
|
1.42
|
0.09
|
-0.06
|
30 | 28.84 | 1.98 | 0.76 | 2.93 | -0.29 | 1.95 | 0.86 | 3.24 | -0.37 | 1.64 | -0.20 | 0.04 |
31 | 29.57 | 1.73 | 0.21 | 2.99 | -0.42 | 1.72 | 0.21 | 2.90 | -0.40 | 1.45 | -0.07 | 0.34 |
32 | 30.58 | 1.61 | 0.59 | 2.83 | -0.22 | 1.58 | 0.66 | 3.10 | -0.26 | 1.43 | 0.17 | 0.18 |
33 | 31.51 | 1.50 | -0.02 | 1.15 | -0.08 | 1.47 | 0.03 | 1.25 | -0.10 | 1.45 | 0.00 | 0.24 |
34 | 32.29 | 1.55 | -0.04 | 1.72 | -0.04 | 1.53 | -0.06 | 1.65 | -0.04 | 1.44 | -0.06 | 0.10 |
35 | 32.97 | 1.49 | -0.04 | 0.38 | -0.07 | 1.47 | -0.04 | 0.42 | -0.06 | 1.43 | 0.00 | -0.25 |
36 | 33.57 | 1.45 | -0.01 | 0.31 | -0.14 | 1.44 | -0.01 | 0.29 | -0.13 | 1.45 | -0.03 | 0.27 |
37 | 34.07 | 1.40 | 0.03 | 0.43 | -0.28 | 1.40 | 0.03 | 0.43 | -0.30 | 1.35 | -0.04 | -0.09 |
38 | 34.51 | 1.36 | 0.03 | 0.22 | -0.45 | 1.36 | 0.04 | 0.24 | -0.45 | 1.37 | 0.05 | 0.41 |
39 | 34.89 | 1.32 | -0.03 | 0.31 | -0.62 | 1.32 | -0.02 | 0.32 | -0.61 | 1.31 | 0.08 | -0.12 |
40 | 35.32 | 1.32 | -0.03 | 0.24 | -0.71 | 1.32 | -0.04 | 0.25 | -0.72 | 1.31 | -0.20 | 0.21 |
41 | 35.71 | 1.35 | -0.07 | 0.25 | -0.83 | 1.35 | -0.07 | 0.26 | -0.81 | 1.34 | 0.07 | 0.31 |
42 | 36.05 | 1.36 | -0.11 | 0.36 | -0.91 | 1.35 | -0.10 | 0.35 | -0.90 | 1.36 | 0.08 | -0.14 |
Girls
| ||||||||||||
24 | 22.74 | 3.43 | 2.74 | 8.08 | -0.47 | 3.58 | 2.74 | 8.08 | -1.44 | 1.58 | 0.63 | 1.70 |
25 | 24.03 | 3.53 | 2.42 | 5.46 | -0.12 | 3.57 | 2.45 | 5.59 | -1.21 | 1.36 | 1.08 | 2.06 |
26 | 24.90 | 3.93 | 5.48 | 34.79 | -0.35 | 3.88 | 5.50 | 34.89 | -1.02 | 1.18 | 0.35 | 0.73 |
24–26
|
24.12
|
3.77
|
3.87
|
21.55
|
-0.31
|
3.69
|
4.04
|
20.90
|
-1.14
|
1.34
|
0.57
|
1.01
|
27 | 25.49 | 2.88 | 2.36 | 6.35 | -0.63 | 2.86 | 2.42 | 6.63 | -1.14 | 1.53 | -0.08 | -0.08 |
28 | 25.97 | 1.59 | 0.57 | 1.05 | -1.14 | 1.53 | 0.47 | 0.87 | -1.22 | 1.50 | 0.08 | -0.03 |
29 | 27.46 | 1.83 | 1.18 | 3.11 | -0.58 | 1.79 | 1.31 | 3.68 | -0.74 | 1.52 | 0.04 | 0.23 |
27–29
|
26.50
|
2.25
|
1.26
|
3.53
|
-0.77
|
2.05
|
2.11
|
8.16
|
-0.97
|
1.52
|
0.07
|
0.02
|
30 | 28.39 | 1.98 | 0.95 | 2.27 | -0.40 | 1.96 | 1.03 | 2.62 | -0.56 | 1.37 | -0.47 | 0.29 |
31 | 29.28 | 1.73 | 0.60 | 2.01 | -0.33 | 1.71 | 0.60 | 2.27 | -0.43 | 1.41 | -0.08 | 0.13 |
32 | 30.10 | 1.63 | 0.07 | 0.92 | -0.30 | 1.62 | 0.06 | 0.81 | -0.30 | 1.51 | -0.10 | 0.41 |
33 | 30.91 | 1.58 | 0.46 | 2.29 | -0.20 | 1.57 | 0.47 | 2.32 | -0.24 | 1.36 | 0.08 | 0.04 |
34 | 31.87 | 1.56 | 0.14 | 0.98 | 0.08 | 1.54 | 0.15 | 1.06 | 0.08 | 1.39 | 0.01 | -0.02 |
35 | 32.55 | 1.48 | 0.20 | 0.87 | 0.09 | 1.46 | 0.21 | 0.92 | 0.09 | 1.42 | 0.00 | 0.32 |
36 | 33.09 | 1.40 | 0.05 | 0.46 | 0.01 | 1.40 | 0.05 | 0.42 | 0.00 | 1.36 | -0.12 | -0.14 |
37 | 33.54 | 1.36 | 0.05 | 0.32 | -0.14 | 1.35 | 0.06 | 0.31 | -0.14 | 1.35 | 0.02 | 0.39 |
38 | 33.94 | 1.32 | 0.07 | 0.31 | -0.30 | 1.32 | 0.08 | 0.31 | -0.31 | 1.31 | 0.05 | -0.06 |
39 | 34.28 | 1.27 | 0.04 | 0.33 | -0.49 | 1.26 | 0.05 | 0.33 | -0.51 | 1.23 | -0.23 | 0.08 |
40 | 34.68 | 1.26 | 0.02 | 0.25 | -0.58 | 1.26 | 0.01 | 0.27 | -0.57 | 1.24 | 0.27 | 0.14 |
41 | 35.04 | 1.28 | -0.01 | 0.27 | -0.69 | 1.28 | -0.02 | 0.27 | -0.69 | 1.31 | -0.04 | -0.11 |
42 | 35.32 | 1.30 | -0.04 | 0.10 | -0.79 | 1.29 | -0.03 | 0.16 | -0.83 | 1.33 | -0.38 | 0.07 |
Length (cm) | Log10 [weight(kg)] | Head circumference (cm) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Boys | Girls | Boys | Girls | Boys | Girls | |||||||
Age | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD |
Gestational age (weeks)
| ||||||||||||
24 | 31.9 | 1.3 | 32.1 | 1.2 | -0.165 | 0.064 | -0.178 | 0.069 | 22.4 | 1.5 | 22.7 | 1.5 |
25 | 33.7 | 1.3 | 33.8 | 1.2 | -0.092 | 0.063 | -0.105 | 0.067 | 23.6 | 1.5 | 23.7 | 1.5 |
26 | 35.4 | 1.3 | 35.3 | 1.3 | -0.023 | 0.062 | -0.036 | 0.066 | 24.7 | 1.5 | 24.8 | 1.5 |
27 | 37.0 | 1.3 | 36.8 | 1.3 | 0.041 | 0.061 | 0.027 | 0.065 | 25.8 | 1.5 | 25.8 | 1.5 |
28 | 38.5 | 1.4 | 38.2 | 1.3 | 0.100 | 0.061 | 0.086 | 0.064 | 26.8 | 1.5 | 26.7 | 1.4 |
29 | 39.9 | 1.4 | 39.6 | 1.3 | 0.156 | 0.060 | 0.141 | 0.063 | 27.8 | 1.4 | 27.6 | 1.4 |
30 | 41.2 | 1.4 | 40.8 | 1.3 | 0.207 | 0.059 | 0.193 | 0.062 | 28.7 | 1.4 | 28.5 | 1.4 |
31 | 42.5 | 1.4 | 42.0 | 1.4 | 0.256 | 0.058 | 0.241 | 0.061 | 29.6 | 1.4 | 29.3 | 1.4 |
32 | 43.7 | 1.4 | 43.2 | 1.4 | 0.301 | 0.058 | 0.285 | 0.060 | 30.4 | 1.4 | 30.0 | 1.4 |
33 | 44.8 | 1.4 | 44.3 | 1.4 | 0.343 | 0.057 | 0.327 | 0.059 | 31.2 | 1.4 | 30.8 | 1.4 |
34 | 45.9 | 1.5 | 45.3 | 1.4 | 0.382 | 0.056 | 0.366 | 0.058 | 32.0 | 1.4 | 31.5 | 1.4 |
35 | 47.0 | 1.5 | 46.3 | 1.4 | 0.419 | 0.056 | 0.402 | 0.057 | 32.7 | 1.4 | 32.1 | 1.3 |
36 | 48.0 | 1.5 | 47.3 | 1.5 | 0.453 | 0.055 | 0.436 | 0.057 | 33.4 | 1.4 | 32.8 | 1.3 |
37 | 48.9 | 1.5 | 48.2 | 1.5 | 0.485 | 0.055 | 0.468 | 0.056 | 34.0 | 1.4 | 33.4 | 1.3 |
38 | 49.8 | 1.5 | 49.1 | 1.5 | 0.515 | 0.054 | 0.498 | 0.055 | 34.7 | 1.3 | 34.0 | 1.3 |
39 | 50.7 | 1.6 | 50.0 | 1.5 | 0.544 | 0.053 | 0.525 | 0.054 | 35.2 | 1.3 | 34.5 | 1.3 |
40 | 51.6 | 1.6 | 50.8 | 1.5 | 0.570 | 0.053 | 0.551 | 0.054 | 35.8 | 1.3 | 35.0 | 1.3 |
Age (months)
| ||||||||||||
3 | 61.3 | 1.8 | 60.0 | 1.8 | 0.798 | 0.048 | 0.775 | 0.048 | 41.1 | 1.2 | 40.1 | 1.2 |
6 | 68.1 | 2.0 | 66.6 | 2.0 | 0.909 | 0.044 | 0.884 | 0.045 | 44.1 | 1.2 | 43.0 | 1.1 |
9 | 72.5 | 2.2 | 71.0 | 2.2 | 0.974 | 0.042 | 0.947 | 0.044 | 46.0 | 1.1 | 44.8 | 1.1 |
12 | 76.1 | 2.4 | 74.7 | 2.4 | 1.018 | 0.041 | 0.991 | 0.043 | 47.2 | 1.3 | 46.0 | 1.3 |
15 | 79.6 | 2.6 | 78.2 | 2.6 | 1.053 | 0.041 | 1.026 | 0.043 | 48.1 | 1.4 | 46.9 | 1.3 |
18 | 82.8 | 2.8 | 81.5 | 2.8 | 1.081 | 0.041 | 1.056 | 0.043 | 48.9 | 1.3 | 47.6 | 1.4 |
21 | 85.7 | 2.9 | 84.5 | 3.0 | 1.106 | 0.042 | 1.082 | 0.043 | 49.5 | 1.3 | 48.2 | 1.3 |
24 | 88.3 | 3.1 | 87.2 | 3.1 | 1.128 | 0.043 | 1.105 | 0.042 | 50.0 | 1.3 | 48.7 | 1.3 |