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Table 1 descriptive statistics for variables at level 1 and level 2

From: Social disparities in body mass index (BMI) trajectories among Chinese adults in 1991–2011

  Variable N Mean SD Minimum Maximum
  Level-1 variables      
Male BMI 10,588 22.34 2.91 12.68 57.01
T(time) 10,588 7.99 7.06 0.00 20.00
T2 10,588 113.74 135.41 0.00 400.00
Female BMI 10,530 22.82 3.18 9.03 51.93
T(time) 10,530 7.78 6.97 0.00 20.00
T2 10,530 109.08 132.47 0.00 400.00
  Level-2 variables
Male age 2496 31.68 7.80 18.00 45.00
BMI0(baseline BMI) 2496 21.35 2.37 14.74 32.39
Edu 2496 0.22 0.42 0.00 1.00
Income 2496 8.04 0.93 0.99 11.10
urban/rural 2496 0.29 0.46 0.00 1.00
Female age 2494 31.82 7.69 18.00 45.00
BMI0(baseline BMI) 2494 21.69 2.66 13.95 40.34
Edu 2494 0.17 0.37 0.00 1.00
Income 2494 7.91 0.89 2.15 10.58
urban/rural 2494 0.28 0.45 0.00 1.00