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. 2017 Apr 6;185(9):743–750. doi: 10.1093/aje/kww167

Table 1.

Time-Varying Characteristics of Participants in a Study of Neighborhood Food Environment and Adult Body Mass Index, Northern California, 2006–2011

Variable Mean Standard Deviation Minimum Maximum No. of Individuals No. of Observations
Overall Between-Person Within-Person
BMIa 31.83 7.26 7.04 1.69 15 134 214,830 2,815,549
Good food environment (kernel density) 0.34 0.46 0.45 0.01 0 5.7 198,030 2,810,220
Age, years 63.43 13.07 13.23 1.47 18 109 214,826 3,212,896
Medicaid enrollment (yes/no) 0.02 0.15 0.12 0.04 0 1 213,113 3,003,353
CCI scoreb 2.17 1.92 1.45 0.99 0 19 214,830 3,212,923
Insulin use (yes/no) 0.20 0.40 0.32 0.18 0 1 214,830 3,212,923
Oral medication use (yes/no) 0.42 0.49 0.42 0.25 0 1 214,830 3,212,923
Medication causing weight gain (yes/no) 0.07 0.25 0.18 0.14 0 1 214,830 3,212,923
Medication causing weight loss (yes/no) 0.09 0.28 0.21 0.15 0 1 214,830 3,212,923
Quality of BMI measurement 0.97 0.18 0.11 0.16 0 1 214,830 2,815,549
Month of BMI measurement 6.41 3.40 1.54 3.23 0 1 214,830 2,815,549
Census block group characteristicsc
 Population density, persons/square miled 8,118.38 8,705.75 8,588.29 1,976.85 0 227,475 198,206 2,295,612
 Proportion white 0.59 0.23 0.23 0.05 0 1 198,206 2,295,612
 Proportion black 0.08 0.11 0.11 0.03 0 1 198,206 2,295,612
 Proportion below federal poverty line 0.11 0.11 0.10 0.03 0 1 198,206 2,295,612

Abbreviations: BMI, body mass index; CCI, Charlson comorbidity index.

a Weight (kg)/height (m)2.

b The possible range of scores in the CCI (27) is 0–33. The range in this data set was 0–19.

c Measured at the US Census block group level.

d Number of persons per square mile (per 1.6 km2).