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Table 4 Quantile regression Model 3: results obtained for the different percentiles of the female 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

17.509 (16.280,18.738)2

17.194 (15.691,18.697)2

18.194 (17.111,19.278)2

19.607 (18.600,20.614)2

19.674 (18.566,20.783)2

Age in 2011

0.062 (0.042,0.082)2

0.076 (0.055,0.098)2

0.079 (0.063,0.095)2

0.073 (0.055,0.091)2

0.083 (0.062,0.103)2

Education level

     

None/primary/junior middle school

Reference

Reference

Reference

Reference

Reference

Senior school

-0.529 (-1.108,0.049)

-0.273 (-0.943,0.397)

-0.735 (-1.228,-0.241)2

-0.951 (-1.596,-0.306)2

-0.250 (-1.202,0.701)

College and above

1.232 (-0.622,3.087)

0.201 (-1.572,1.974)

-0.706 (-2.444,1.031)

-1.555 (-3.894,0.784)

0.229 (-2.775,3.234)

Income tertile

     

Low income

Reference

Reference

Reference

Reference

Reference

Middle income

-0.030 (-0.219,0.160)

0.009 (-0.138,0.157)

-0.022 (-0.137,0.092)

-0.041 (-0.172,0.089)

-0.007 (-0.278,0.264)

High income

-0.035 (-0.252,0.183)

-0.010 (-0.158,0.137)

0.008 (-0.175,0.192)

0.023 (-0.164,0.210)

-0.037 (-0.345,0.272)

Energy intake (100 kcal/day)

0.003 (-0.011,0.016)

0.003 (-0.009,0.014)

0.001 (-0.006,0.009)

0.004 (-0.004,0.012)

0.008 (-0.004,0.020)

Total physical activity (METs/d)

-0.002 (-0.006,0.001)

0.000 (-0.003,0.003)

-0.001 (-0.004,0.002)

-0.001 (-0.004,0.001)

-0.004 (-0.007,-0.001)3

Sedentary time (hours/d)

-0.005 (-0.047,0.037)

-0.002 (-0.041,0.036)

0.039 (0.007,0.071)3

0.019 (-0.021,0.059)

0.005 (-0.043,0.053)

Urbanization index

-0.003 (-0.015,0.008)

-0.006 (-0.019,0.008)

-0.003 (-0.012,0.006)

-0.004 (-0.012,0.004)

-0.004 (-0.013,0.005)

  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.