Table 1.

Child and Mother Characteristics by sex

Characteristic (N=95)	Boys n=42	Girls n=48	p-value
Child
Gestational age at birth (weeks) mean (SD)	29.50 (2.34)	29.69 (2.45)	0.712
Birth weight (g) mean (SD)	1,377 (474)	1,289 (380)	0.322
Child age at testing (y) (SD)	7.7 (0.31)	7.7 (0.27)	0.349
Skin-breaking procedures (SD)	107 (85)	90 (78)	0.305
Cumulative dose of Morphine (SD)	1.2 (3.8)	1.3 (4.1)	0.934
Days of mechanical ventilation (SD)	7.8 (11.5)	9.3 (18.3)	0.636
Illness severity day 1 SNAP-II (SD)	11.5 (10.1)	9.6 (11.6)	0.397
Number of surgeries (n) mean (SD)	0.3 (0.7)	0.2 (0.6)	0.263
Number of postnatal infection (n) mean (SD)	0.3 (0.4)	0.2 (0.4)	0.811
Mother
Education (years) mean (SD)	16.2 (3.0)	15.5 (2.6)	0.265
Beck Depression Index-II mean (SD)	7.22 (8.26)	7.14 (6.13)	0.956
State anxiety mean (SD)	29.36 (10.17)	30.76 (8.37)	0.463
Trait anxiety mean (SD)	34.29 (9.69)	37.78 (8.34)	0.062