Table 5.

Multivariate logistic regression for hairdressers of age > 45 year-old

	N	Odds ratio	95% confidence interval
Monthly standing work hours
25-120	11	1.0
121-168	13	9.7	(0.7-132.5)
169-208	12	7.4	(0.6-89.9)
209-260	10	6.4	(0.5-86.2)
261-360	9	31.8	(1.8-566.5)*
Number of years working as a hairdresser
0-30	20	1.0
31-42	18	10.9	(1.6-73.8)*
43-57	17	12.0	(1.6-88.5)*
Doing housework in standing position
No	8	1.0
Yes	47	0.9	(0.1-7.6)
Family history of varicose veins
No	42	1.0
Yes	13	1.6	(0.4-7.1)

*p < 0.05.