Quality of life among patients undergoing bariatric surgery: associations with mental health- A 1 year follow-up study of bariatric surgery patients

Table 2 Pre- and postoperative HRQOL in the study population

	Preoperative Mean (SD) N = 127	Postoperative Mean (SD) N = 87	Difference in scores *	Population norm **
SF-36 Physical Functioning Subscale Effect size***	56.8 (23.3) -1.41	87.5 (19.1) - .11	< .001	89.6
SF-36 Physical Role Limitation Subscale Effect size***	40.3 (39.1) -1.06	74.7 (39.3) - .18	< .001	81.9
SF-36 Bodily Pain Subscale Effect size***	46.3 (25.1) -1.18	66.5 (29.9) - .31	< .001	75.8
SF-36 General Health Subscale Effect size***	47.8 (22.2) -1.38	78.7 (23.0) .01	< .001	78.5
SF-36 Vitality Subscale Effect size***	40.9 (19.4) - .95	61.1 (21.4) .09	< .001	59.3
SF-36 Social Function Subscale Effect size***	71.5 (25.0) - .57	89.0 (19.9) .16	< .001	85.9
SF-36 Emotional Role Limitation Subscale Effect size***	78.8 (36.5) - .12	83.7 (34.4) - .15	.201	83.4
SF-36 Mental Health Subscale Effect size***	73.3 (16.1) - .32	80.9 (17.2) .16	< .001	78.4

*Difference in scores from preoperative assessment to postoperative assessment, Wilcoxon Signed Rank Test
** Population norm [39], adjusted for age and gender.
*** Effect size is calculated by subtracting the mean score of the population norm (adjusted for age and gender) from the mean score of the patients group and divided by the standard deviation of the patient group.

ISSN: 1477-7525