TABLE 7.

Linear multivariate regression by groups.

Predictors by groups	b (CI 95%)	Beta	p	R 2	ES (f2) R2	Adjusted R2	ES (f2) adjusted R2
Extremely preterm (N = 46)
Cognitive
Periventricular hemorrhage	–13.7(–26.4 to –1.1)	–0.38	0.035	43.9%	0.78###	38.6%	0.63###
NICU seizures	–16.7(–29.1 to –4.3)	–0.47	0.011
Language
Maternal formal education	3.5 (0.40 to 6.5)	0.34	0.025	20.6%	0.26##	16.4%	0.20##
NICU seizures	–8.5 (–17.0 to 0.00)	–0.29	0.050
Motor
DAIS Active play	12.7 (6.8 to 18.5)	0.54	<0.001	78.8%	3.72###	72.20%	2.60###
NICU seizures	–19.8 (–30.1 to –9.4)	–0.49	0.001
Apgar 5th minute	3.8 (0.30 to 7.4)	0.27	0.037
Maternal formal education	5.1 (1.4 to 8.7)	0.35	0.010
N0 children at home	6.4 (0.30 to 12.5)	0.27	0.041
Very preterm (N = 101)
Cognitive
NICU stay	–0.20 (–0.40 to –0.10)	–0.42	<0.004	36.3%	0.57###	31.20%	0.45###
Breastfeeding (months)	0.90 (0.10 to 1.7)	0.30	0.033
Maternal formal education	2.7 (0.40 to 5.8)	0.24	0.082
Language
N0 Prenatal care visits	1.8 (0.20 to 3.5)	0.28	0.028	27.9%	0.39###	23.30%	0.30##
Maternal formal education	4.2 (1.5 to 6.9)	0.39	0.003
NICU seizures	–11.5 (–25.1 to 2.1)	–0.21	0.096
Motor
DAIS Active play	10.6 (5.0 to 16.1)	0.47	<0.001	47.1%	0.89###	41.30%	0.70###
Parents living together	19.3 (4.8 to 33.7)	0.33	0.010
Oxygen therapy (days)	–0.30 (–0.60 to 0.01)	–0.25	0.057
Maternal formal education	2.8 (–0.20 to 5.9)	0.24	0.064
Moderate/late preterm (N = 38)
Cognitive
Apgar 5th minute	7.2 (1.0 to 13.3)	0.49	0.024	21.3%	0.27##	14.70%	0.17##
Language
Breastfeeding (months)	1.0 (0.10 to 1.9)	0.53	0.028	28.3%	0.39###	23.50%	0.31##
Motor
Breastfeeding (months)	1.2 (0.10 to 2.3)	0.57	0.043	32.3%	0.48###	26.20%	0.35###

DAIS, Daily Activities of Infant Scale; CI, Confident Interval; p < 0.05; ES, Effect Size of Cohen (f²) was used as a measure of effect size for the regression (cut off: ^##moderate 0.15 to 0.34; ^###large > 0.35) using effect size calculator for regression: https://www.danielsoper.com/statcalc/calculator.aspx?id=5.