Characteristic Processes in Close Peer Friendships of Preterm Infants at Age 12

Table 2

Neonatal characteristics for study sample by prematurity group (𝑁=166).

	Full term; ≥38 wga; 𝑛=40; 𝑀 (SD)	Preterm; <37 wga; 𝑛=126; 𝑀 (SD)
Boys/girls (𝑛)	19/21	54/72
Birth weight* (grams)	3422.9 (338.6)	1257.2 (321.2)
Gestational age* (weeks)	39.9 (.81)	29.9 (2.6)
Length of stay* (days)	3.0 (.42)	52.3 (26.0)
Hobel neonatal risk score* [14]	1.5 (3.6)	85.9 (31.5)
Bronchopulmonary dysplasia* (𝑛/%)	0 (0%)	22 (17%)
Sepsis^∧(𝑛/%)	0 (0%)	12 (10%)
Necrotizing enterocolitis^# (𝑛/%)	0 (0%)	16 (13%)
Meningitis (𝑛/%)	0 (0%)	3 (2%)
Intraventricular hemorrhage (𝑛/%)	0 (0%)	25 (20%)
SES [15]	39.4 (12.5)	42.3 (14.6)

Note. wga: weeks of gestational age; ^∧𝑃=.05; ^#𝑃=.01; *𝑃=.000; SES: socioeconomic status.