Types of gestational age | Low stable | High increasing | ||||
Boys | Girls | P value for interaction | Boys | Girls | P value for interaction | |
LAZ* | ||||||
Early-term | 1.31 (1.06 to 1.63) | 1.59 (1.22 to 2.09) | 0.323 | 0.82 (0.59 to 1.13) | 0.62 (0.43 to 0.90) | 0.192 |
Full-term | 1.00 | 1.00 | 1.00 | 1.00 | ||
WAZ* | ||||||
Early-term | 1.25 (1.01 to 1.55) | 1.38 (1.06 to 1.81) | 0.669 | 0.78 (0.58 to 1.05) | 1.06 (0.75 to 1.50) | 0.245 |
Full-term | 1.00 | 1.00 | 1.00 | 1.00 | ||
BMIZ† | ||||||
Early-term | 1.05 (0.82 to 1.35) | 1.08 (0.80 to 1.45) | 0.930 | 0.82 (0.62 to 1.07) | 1.35 (0.97 to 1.88) | 0.037 |
Full-term | 1.00 | 1.00 | 1.00 | 1.00 |
*Adjusted for maternal age at delivery, maternal height, maternal weight before pregnancy, paternal height, paternal weight, maternal smoking, drinking, complications during pregnancy, whether infant was mother’s firstborn, caesarean section, and neonatal complications.
†Adjusted for maternal age at delivery, maternal pre-pregnancy overweight/obsity, weight gain during pregnancy, maternal smoking, drinking, complications during pregnancy, whether infant was mother’s firstborn, caesarean section, and neonatal complications.
BMI, body mass index; BMIZ, BMI-for-age z-score; LAZ, length-for-age z-score; WAZ, weight-for-age z-score.