17 Jul

Changes in gallbladder motility and gallstone formation following laparoscopic gastric banding: RESULTS (Part 1)

Statistical analysis

The statistics program SPSS (10 Edition SPSS Inc, USA) was used to perform an analysis of variance (ANOVA). The Bonferroni correction or the nonparametric Mann-Whitney analysis were used where appropriate. A P<0.05 was accepted as significant.

Normal versus obese

Table 1 summarizes the age and BMI of both male and female volunteers. There was no difference between the two sexes in any of the parameters measured in the study. Combining both men and women was therefore appropriate, although an obvious difference in the distribution of the sexes existed between the healthy and the obese groups (P=0.005 by Fisher’s exact test).

TABLE 1 Demographics and gallbladder measurements of both male and female volunteers

Men (n=14) Women (n=12)
Age 35 (23-57) 41 (25-59)
Body mass index 26.4±0.7 23.7±0.6
Gallbladder volume (mL) 22.3±2.1 20.1±2.4
Gallbladder emptying (%) 76.2±4.3 77.8±2.4
Gallbladder residual 4.9±0.9 4.2±0.5
volume (%)
Gallbladder refilling (mL/min) 0.10±0.04 0.10±0.05

Data are presented as mean ± SEM, except for age (years) which is presented as median (range). No statistical differences were noted between the two groups
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