Table 1. Background characteristics of study participants.

Characteristics	Early Onset (PE) (N = 273)		Late Onset (PE) (N = 347)		Total (N = 620)		P-value
Age (years)
Mean [SD]	29.0	[6.1]	28.0	[6.4]	28.0	[6.3]	0.008
	n	%	n	%	n	%
Parity
0	30	11.0	42	12.1	72	11.6	0.060
1	88	32.2	143	41.2	231	37.3
2	78	28.6	73	21.0	151	24.4
3+	77	28.2	89	25.6	166	26.8
Gravidity
1	72	26.4	150	43.2	222	35.8	<0.001
2	80	29.3	83	23.9	163	26.3
3	66	24.2	59	17.0	125	20.2
4+	55	20.1	55	15.9	110	17.7
Formal Education
< = Primary^	82	30.0	110	31.7	192	31.0	0.700
Secondary	112	41.0	133	38.3	245	39.5
Tertiary	79	28.9	104	30.0	183	29.5
Employment
Employed†	134	49.1	161	46.4	295	47.6	0.500
Unemployed‡	139	50.9	186	53.6	325	52.4
Marital Status
Married	220	80.6	291	83.9	511	82.4	0.300
Single	53	19.4	56	16.1	109	17.6
Place of Residence
Nairobi County	205	75.1	289	83.3	494	79.7	0.010
Others	68	24.9	58	16.7	126	20.3
Gestational age at onset, weeks
	273	SD	347	SD	620	SD	<0.001
Mean (SD)	29.2	3.2	37.3	2.1	33.7	4.8

Significant results (P<0.05) in bold color

* (n/N*100)

^None and primary education

† Includes Business, self-employed

‡ includes housewife

**includes spontaneous vaginal delivery, assisted delivery and breech delivery