. 2011 Jan;101(1):71–78. doi: 10.2105/AJPH.2009.187567

TABLE 1.

Weight Status and Neighborhood Food Environment of the Main Sample and Urban and Rural Subsamples: NLSY79, 1998–2004

	Main Sample (n = 27 825), % or Mean (SD)	Urban Subsample (n = 20 396), % or Mean (SD)	Rural Subsample (n = 7429), % or Mean (SD)
Weight status
Obese	35.4	35.7	34.9
Body mass index, kg/m²	28.9 (6.11)	29.0 (6.1)	28.9 (6.13)
Neighborhood food retail environment^a
Supermarket density per square mile	0.16 (0.34)	0.21 (0.45)**	0.024 (0.077)
Small grocery store density per square mile	1.09 (4.52)	1.45 (5.19)**	0.076 (1.18)
Convenience and specialty store density per square mile	0.75 (2.8)	0.99 (3.23)**	0.066 (0.379)
At least 1 supermarket	72.8	82.0**	47.7
At least 1 small grocery store	84.9	89.5**	72.1
At least 1 convenience or specialty store	83.3	91.0**	62.3
Neighborhood food service environment^a
Limited-service restaurant density per square mile	2.12 (6.32)	2.81 (7.23)**	0.23 (1.08)
Full-service restaurant density per square mile	2.36 (12.69)	3.13 (14.7)**	0.25 (1.22)
At least 1 limited-service restaurant	93.1	98.9**	77.2
At least 1 full-service restaurant	95.2	98.6**	86.0

Note. NLSY79 = National Longitudinal Survey of Youth 1979. Every year that an individual was included in the sample was a separate observation. Therefore, the percentages and means refer to person-year observations. A person-year observation was included in the urban sample each year in which the respondent resided in an urban area. A person-year observation was included in the rural sample for each year in which the respondent resided in a rural area.

For zip code area of residence.

^** P < .05, for significant difference from the rural subsample,.