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Table 4

Factors affecting weight loss in patients who attended for data collection at 12 months (n = 642).a

nMean (SD) weight change, kg95% CI
Age, years
 <2521−1.69 (6.93)−4.84 to −1.47
 25–3455−2.25 (8.07)−4.43 to −0.07
 35–44121−4.18 (8.69)−5.75 to −2.62
 45–54139−2.82 (6.45)−3.90 to −1.74
 55–64173−2.79 (5.87)−3.67 to −1.91
 ≥65133−2.71 (4.58)−3.50 to −1.92

Sex
 Male171−3.40 (7.31)−4.50 to −2.30
 Female471−2.80 (6.38)−3.38 to −2.22

Baseline BMI, kg/m2
 28 to <3028−1.87 (4.96)−3.80 to −0.05
 30 to <35244−2.02 (4.89)−2.64 to −1.41
 35 to <40210−2.94 (6.42)−3.81 to −2.06
 ≥40160−4.60 (8.86)−5.98 to −3.22

Diabetes
 Not present510 3.30 (6.98) 3.91 to  2.70
 Present132−1.63 (4.91)−2.47 to −0.78

Arthritis
 Not present482−3.07 (6.86)−3.68 to −2.46
 Present160−2.62 (5.94)−3.55 to −1.70

Visits in 12 months
 0–5212−0.65 (5.37)−1.38 to −0.07
 6–9200−2.60 (6.06)−3.45 to −1.76
 10–15148−4.67 (6.13)−5.66 to −3.67
 16–2049−5.95 (6.74)−7.88 to −4.01
 >2133−7.82 (11.62)−11.94 to −3.70
aStratum-specific mean weight losses. Patients in each stratum (as with the whole group) on average lost weight. No confidence intervals included the null value of 0 kg. BMI = body mass index.