Physical Activity and Quality of Life in Severely Obese Adults during a Two-Year Lifestyle Intervention Programme

Table 2

Mixed-effect model estimates: mean changes (95% CI) in quality of life outcomes during the two-year lifestyle intervention for severely obese adults.

Measure	: change from	: change from	: change from
SF-36 physical component summary^a	5.7 (7.4, 4.0)	4.4 (6.3, 2.5)	3.3 (5.5, 1.1)
Effect size	0.61	0.54	0.48
SF-36 mental component summary^b	5.9 (8.6, 3.1)	−0.4 (−2.7, 3.5)	−1.8 (−1.8, 5.3)
Effect size	0.55	0.02	−0.06
Obesity-related problems scale^c	−8.4 (−2.9, −13.9)	−11.2 (−5.0, −17.4)	−13.3 (−6.2, −20.4)
Effect size	0.30	0.49	0.57
Life satisfaction^d	0.99 (1.30, 0.67)	0.47 (0.82, 0.12)	0.20 (0.60, 0.20)
Effect size	1.00	0.55	0.22

: before the intervention (); : after six weeks (); : year one (); : year two ().
^aScale 15.4–62.1: higher scores represent better quality of life, Medical Outcomes Study Short-Form 36 Health Survey.
^bScale 10.1–64.0: higher scores represent better quality of life, Medical Outcomes Study Short-Form 36 Health Survey.
^cScale 0–100: higher scores represent more obesity-related problems.
^dScale 1–7: higher scores represent better life satisfaction.
Significant values (≤.05) in bold.
Effect sizes for the within-group changes were calculated by subtracting the mean estimates of follow-ups from the mean estimates at baseline divided by the SD of the latter. They were judged against the standard criteria proposed by Cohen: trivial (<0.2), small (0.2 to <0.5), moderate (0.5 to <0.8), and large (≥0.8) [41].
Confidence interval: CI.