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Table 1 Multivariate effects of covariates on median percent weight change for those completing a first referral course (median, p-value and 95% confidence interval)

From: Weight Watchers on prescription: An observational study of weight change among adults referred to Weight Watchers by the NHS

   Percent Weight Change
  N (%) Median P value 95% CI
Course Duration (weeks)     
12 7,972 (67) - - -
13-24 3,243 (27) 0.70 < 0.001 (0.51, 0.89)
>24 636 (5) -0.84 < 0.001 (-1.21, -0.46)
Gender     
Female 10,577 (89) - - -
Male 1,274 (11) -0.54 < 0.001 (-0.81, -0.27)
Age (years)     
< 40 2,818 (24) - - -
40-49 2,606 (22) -0.25 0.051 (0.49, 0.00)
50-59 2,612 (22) -0.34 0.007 (-0.59, -0.09)
60+ 3,815 (32) -0.14 0.237 (-0.36, 0.09)
Start BMI     
<30 1,189 (10) - - -
30-34 4,315 (36) -0.32 0.035 (-0.62, -0.02)
35-39 3,461 (29) -0.04 0.775 (-0.35, 0.26)
40+ 2,886 (24) 0.38 0.018 (0.07, 0.70)