Table 1.

Demographic characteristics of 166 pregnant women at 14-16 weeks gestation by delivery status and PSQI Score

Characteristic	Total		Term Deliveries		Preterm Deliveries		PSQI ≤ 5		^PSQI > 5
	N = 166		N = 151		N = 15		N = 84		N = 48
	N	%	N	%	N	%	N	%	N	%
Age*
18-24	37	22.7	34	23.0	3	20.0	15	18.07	10	20.83
25-29	53	32.5	48	32.4	5	33.3	31	37.35	13	27.08
30-34	47	28.8	44	29.7	3	20.0	22	26.51	15	31.25
35+	26	16.0	22	14.9	4	26.7	15	18.07	10	20.83
Income*#
< $30,000	40	24.5	34	23.0	6	40.0	16	19.51	14	29.17
$30,000–60,000	38	23.3	31	20.9	7	46.7	18	21.95	16	33.33
Over $60,000	85	52.2	83	56.1	2	13.3	48	58.54	18	37.50
Education*
Primary, elementary, middle school	5	3.05	4	2.68	1	6.67	1	1.19	1	2.08
High school/or GED	23	14.02	22	14.77	1	6.67	13	15.48	7	14.58
Technical or vocational school	8	4.88	7	4.70	1	6.67	3	3.57	4	8.33
Some college but no degree	39	23.78	33	22.15	6	40.00	16	19.05	17	35.42
Associate degree	16	9.76	16	10.74	0	0.00	9	10.71	6	12.50
Bachelor's degree	44	26.83	40	26.85	4	26.67	26	30.95	9	18.75
Other graduate degree (Masters, Doctorate)	22	13.41	22	14.77	0	0.00	13	15.48	2	4.17
Certificate	7	4.27	5	3.36	2	13.33	3	3.57	2	4.17
Ethnicity**
Non-Hispanic White	78	47.56	71	47.7	7	46.7	40	47.62	21	43.75
All others	86	52.44	78	52.3	8	53.3	44	52.38	27	56.25
Parity
0	73	44.0	68	45.0	5	33.3	35	41.67	23	47.92
1	57	34.3	49	32.5	8	53.3	31	36.90	16	33.33
2	21	12.7	21	13.9	0	0.0	12	14.29	7	14.58
3+	15	9.0	13	8.6	2	13.4	6	7.14	2	4.17
History of Preterm Birth
Yes	19	11.4	18	11.9	1	6.7	8	9.52	5	10.42
No	147	88.6	133	88.1	14	93.3	76	90.48	43	89.58
Prenatal Medical Risk Factors
0	79	47.6	72	47.7	7	46.7	33	39.29	25	52.08
1-2	71	42.8	63	41.7	8	53.3	39	46.43	21	43.75
3+	16	9.6	16	10.6	0	0	12	14.28	2	4.16

^*Missing data from 3 women.

^**Missing data from 2 women.

^#Wilcoxon/Fisher exact tests show differences in the income categories (P = 0.003) between women who delivered preterm vs. term.

^{^}PSQI > 5 indicates poor sleep quality.