Boys (n = 1,233) | Girls (n = 1,181) | P-value | |
---|---|---|---|
Second trimester | |||
Gestational age (weeks) | 20.6 (18.7 - 23.3) | 20.4 (18.5 - 23.1) | <0.01 |
Estimated fetal weight (grams) | 386 (91) | 374 (86) | <0.01 |
Femur length (mm) | 33.3 (3.2) | 33.2 (3.3) | 0.55 |
Head circumference (mm) | 181.0 (13.1) | 177.2 (13.0) | <0.01 |
Third trimester | |||
Gestational age (weeks) | 30.4 (28.6 - 33.0) | 30.3 (28.3 - 32.8) | <0.01 |
Estimated fetal weight (grams) | 1646 (258) | 1620 (268) | <0.01 |
Femur length (mm) | 57.4 (2.9) | 57.4 (2.9) | 0.64 |
Head circumference (mm) | 288.8 (11.8) | 283.7 (11.2) | <0.01 |
Birth | |||
Gestational age | 40.1 (35.0 - 42.4) | 40.1 (35.2 - 42.1) | 0.42 |
Weight (grams) | 3518 (596) | 3400 (574) | <0.01 |
Length (cm)* | 55.1 (2.4) | 54.0 (2.1) | <0.01 |
Head circumference)* | 38.1 (1.3) | 37.3 (1.2) | <0.01 |
Weight < 2500 grams (%) | 29 (2.4) | 26 (2.2) | 0.80 |
Preterm birth (<36 weeks) (%) | 41 (3.3) | 37 (3.1) | 0.79 |
Age 6 months | |||
Age at visit (months) | 6.2 (5.2 - 7.9) | 6.2 (5.2 - 7.9) | 0.28 |
Weight (grams) | 8,078 (845) | 7,540 (812) | <0.01 |
Length (cm) | 68.5 (2.4) | 66.8 (2.3) | <0.01 |
Head circumference (cm) | 44.2 (1.3) | 43.1 (1.7) | <0.01 |
Age 14 months | |||
Age at visit (months) | 14.3 (13.6 - 16.2) | 14.3 (13.4 - 16.0) | 0.05 |
Weight (grams) | 10,824 (1,070) | 10,191 (1,018) | <0.01 |
Length (cm) | 78.9 (2.6) | 77.5 (2.6) | <0.01 |
Head circumference (cm) | 47.7 (1.3) | 46.6 (1.1) | <0.01 |
Age 24 months | |||
Age at visit (months) | 24.8 (23.4 - 28.1) | 24.8 (23.4 - 28.1) | 0.48 |
Weight (grams) | 13,140 (1,376) | 12,651 (1,412) | <0.01 |
Length (cm) | 88.9 (3.4) | 87.7 (3.4) | <0.01 |