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. Author manuscript; available in PMC: 2017 Mar 1.
Published in final edited form as: Int J Hyg Environ Health. 2015 Nov 10;219(2):176–183. doi: 10.1016/j.ijheh.2015.10.004

Table 1.

Baseline characteristics of 1183 women in the GRAPHS cohort

Characteristic Included in
analysis (n = 817)
Excluded from
analysis (n = 366)

Mean ± SD p-value from
two-sample
t-test

Age (years) 27.3 ±7.1 27.8 ± 7.6 0.29

BMI (kg/m2) 23.3 ± 3.3 23.4 ± 3.5 0.64

Gestational age (weeks) 16.0 ± 4.3 15.8 ± 4.4 0.42

Asset Index (centered at 0)a −0.02 ± 2.2 0.07 ± 2.3 0.53

Percent p-value from
Fisher’s
exact test

Known history of hypertension (%) 1.4 1.9 0.45

Known history of diabetes (%) 0 0.001 0.10

Ever smoker (%) 0.4 0.5 0.65

Smoker in household or compound (%) 21 20 0.82

Education
(%):
None 38 40 0.59

Primary School 27 23

Middle School or above 35 30

NA 0 6

Marital status
(%):
Married 53 54 0.37

Living with partner 32 31

Single 14 10

Widowed/Divorced/Separated 0.4 0

NA 0 5

Employment
status (%):
None 31 28 0.67

Farmer/laborer/domestic worker 40 40

Trader/food seller/businesswoman 21 17

Other 8 9

NA 0 5

Cooking
location (%):
Primary: Totally open 60 55 0.90

Partially enclosed 21 21

Fully enclosed 18 18

NA 0 6

Secondary: Totally open 14 12 0.65

Partially enclosed 30 27

Fully enclosed 16 13

None 41 42

NA 0 6

Fuel type
(%):
Primary Wood 96 88 0.07

Crop Residue 0.1 0

Charcoal 4 5

LPG 0.2 1

NA 0 6

Secondary: Wood 6 7 0.19

Crop Residue 2 2

Charcoal 49 40

None 42 46
NA 0 6
a

The Asset Index was constructed using a Principal Component Analysis of variables including: type of housing materials, type of toilet facility, primary water source, type of home ownership, household ownership of livestock animals, and household ownership of consumer durables (e.g. table, mattress, radio, television, bicycle, motorcycle, car, phone, radio, fan, computer).