Table 2.

Socioeconomic characteristics of very preterm infants.

	Intervention (n = 69)	Control (n = 67)	p-Value
Marriage	69 (100)	66 (98.5)	0.493
Income (thousand won)			0.491
<2000	2 (2.9)	3 (4.5)
2000~4000	30 (43.5)	30 (44.8)
>4000	37 (53.6)	34 (50.8)
Primary caretaker—mother	66 (95.7)	65 (97)	1.000
Information on father
Age (year)	37 ± 4.9	37 ± 3.5	0.740
College education or above	59 (85.5)	63 (94)	0.157
Job			0.667
salaried employee	41 (59.4)	41 (62.1)
public officials	1 (1.5)	4 (6.1)
self-employed	8 (11.6)	7 (10.6)
professional	14 (20.3)	10 (15.2)
others	5 (7.3)	4 (6.1)
Information on mother
Age (year)	34.8 ± 4.2	34.1 ± 2.9	0.296
College education or above	59 (85.5)	61 (91)	0.556
Job			0.472
salaried employee	19 (27.5)	14 (20.9)
public officials	1 (1.5)	0 (0)
self-employed	1 (1.5)	3 (4.5)
professional	9 (13)	6 (9)
others	39 (56.5)	44 (65.7)