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Table 3 Quantile regression Model 3: results obtained for the different percentiles of the male BMI (95% CI 1 )

From: Use of quantile regression to investigate changes in the body mass index distribution of Chinese adults aged 18–60 years: a longitudinal study

   

Coefficient

  
 

10th

25th

50th

75th

90th

Intercept

18.655 (17.381,19.930)2

19.091 (18.162,20.020)2

18.977 (17.827,20.127)2

21.062 (19.952,22.172)2

22.374 (20.620,24.129)2

Age in 2011

0.010 (-0.008,0.028)

0.015 (0.001,0.030)3

0.041 (0.020,0.062)2

0.028 (0.012,0.045)2

0.009 (-0.016,0.035)

Education level

     

None/primary/junior middle school

Reference

Reference

Reference

Reference

Reference

Senior school

0.231 (-0.434,0.897)

0.278 (-0.090,0.646)

-0.052 (-0.586,0.486)

0.184 (-0.205,0.573)

0.214 (-0.314,0.742)

College and above

-0.071 (-0.263,2.489)

0.490 (-1.820,2.800)

-0.093 (-1.390,1.122)

1.451 (-1.082,3.985)

0.789 (-1.993,3.570)

Income tertile

     

Low income

Reference

Reference

Reference

Reference

Reference

Middle income

0.171 (-0.009,0.351)

0.042 (-0.125,0.210)

-0.003 (-0.157,0.150)

0.009 (-0.136,0.155)

0.188 (-0.077,0.454)

High income

0.187 (-0.035,0.409)

0.069 (-0.148,0.287)

0.207 (0.001,0.414)3

0.331 (0.140,0.523)2

0.319 (0.013,0.625)3

Energy intake (100 kcal/day)

0.006 (-0.005,0.017)

0.008 (0.000,0.016)3

0.009 (0.001,0.017)3

-0.002 (-0.012,0.008)

0.004 (-0.010,0.018)

Total physical activity (METs/d)

-0.002 (-0.005,0.001)

-0.006 (-0.008,-0.003)2

-0.003 (-0.007,0.000)3

-0.003 (-0.006,0.001)

-0.004 (-0.008,0.000)3

Sedentary time (hours/d)

-0.016 (-0.054,0.022)

0.002 (-0.030,0.034)

-0.011 (-0.039,0.018)

-0.013 (-0.051,0.025)

-0.031 (-0.084,0.021)

Urbanization index

0.017 (0.007,0.027)2

0.013 (0.004,0.022)2

0.013 (0.005,0.022)2

0.009 (0.001,0.017)3

0.017 (0.004,0.030)2

  1. Note: Less than senior school education or greater is the reference group for education and the low income tertile is the reference group for income.
  2. 1CI: Confidence interval.
  3. 2P < 0.01.
  4. 3P < 0.05.