Table 2.

Multivariate linear regression of factors associated with Bayley III cognitive development scores

Characteristics	n (%)	β†(95% CI)	β‡(95% CI)	β§(95% CI)	β¶(95% CI)
All subjects (n=1444)
Full term††	87 (6.0)	Ref.	Ref.	Ref.	Ref.
Born at 37 gestational week	205 (14.2)	−1.213 (−2.718 to 0.291)	−1.102 (− 2.604 to 0.400)	−0.950 (−2.458, 0.557)	−0.620 (− 2.124 to 0.885)
Born at 38 gestational week	1152 (79.8)	0.968 (0.058 to 1.994)	0.997 (− 0.026 to 2.021)	0.963 (− 0.060 to 1.986)	0.770 (− 0.248 to 1.789)
Infants (n=844)
Full term††	46 (5.5)	Ref.	Ref.	Ref.	Ref.
Born at 37 gestational week	123 (14.6)	−2.810 (−4.847 to 0.774)**	−2.723 (−4.765 to 0.680)**	−2.545 (−4.590 to 0.500)*	−2.257 (−4.280 to 0.235)*
Born at 38 gestational week	675 (80.0)	0.450 (− 0.853 to 1.768)	0.532 (− 0.780 to 1.844)	0.548 (− 0.765 to 1.861)	0.120 (− 1.180 to 1.421)
Toddlers (n=600)
Full term††	41 (6.8)	Ref.	Ref.	Ref.	Ref.
Born at 37 gestational week	82 (13.7)	0.623 (− 1.618 to 2.863)	0.639 (− 1.567 to 2.874)	0.720 (− 1.528 to 2.969)	0.935 (− 1.356 to 3.225)
Born at 38 gestational week	477 (79.5)	1.720 (0.075 to 3.366)*	1.671 (0.032 to 3.250)	1.449 (− 0.140 to 3.139)	1.418 (− 0.243 to 3.076)

*p <0.05; **p < 0.01.

†Not adjusted for other variables.

‡Adjusted for children’s characteristics (weight for length Z-score, gender).

§Adjusted for children’s and maternal characteristics (delivery mode, parity, maternal age).

¶Adjusted for children’s and maternal characteristics, and socioeconomic factors (city, mother’s and father’s education and occupation).

††Children born at 39–41 gestational weeks.