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Table 2 Descriptive statistics (N = 14,689)

From: Re-visiting the relationship between neighbourhood environment and BMI: an instrumental variables approach to correcting for residential selection bias

Variable Definition Mean/proportion Standard deviation
Residential walkability and weight measures
RESWALK Factor score for neighbourhood walkability −0.24 0.98
BMI Weight in kg divided by height in meters squared 24.27 4.88
BMIBG ≥ 25 Proportion of the women with a BMI > 25.0 0.32 0.47
D Variables (Exogenous): Hypothesized to affect BMI and residential walkability
AGE Age in years 25.58 3.98
EDUC Years of schooling 13.93 1.88
MARRIED 1 = married 0.89  
BMIYR Year of pregnancy (1 = 1995… 11 = 2005) 6.02 3.12
SIBBMI Average age and year standardized sibling BMI residual −0.03 0.71
Z Variables hypothesized to affect residential walkability only
NSCHOOL Number of schools 0.61 0.90
NCHURCH Number of churches 0.91 0.87
LIBRARY Presence of one or more public libraries (1 = yes) 0.04 0.21
UNDER16 Proportion of the population ≤ Age 15 0.24 0.08