Table 1.

Maternal Demographic Characteristics

	Twin (n = 60)	Singleton (n = 60)	p
Age (y)	31.8 ± 5.6	27.4 ± 6.4	< .001
Gravidity	3.32 ± 2.23	3.26 ± 2.4	0.86
Parity	1.20 ± 1.59	1.18 ± 1.26	0.95
Ethnicity*			0.59
Caucasian	22 (37.3%)	15 (30.6%)
African-American	15 (25.4%)	14 (28.6%)
Hispanic	16 (27.1%)	16 (32.6%)
Asian	5 (8.5%)	1 (2.0%)
Other	1 (1.7%)	3 (6.1%)
Missing	1	11
Body mass index	31.8 ± 7.2	31.0 ± 2.9	0.54
Gestational age at betamethasone dosing (wk)	29.0 ± 2.9	29.0 ± 2.9	0.16
Interval from betamethasone to delivery (d)	12.1 ± 15.0	9.0 ± 10.0	0.16

^*Missing values.

Data presented as mean ± standard deviation, or n (%).