Table 1.

Comparison of the demographic characteristics of the participants in three different study groups.

	Group 1	Group 2	Group 3	Total	P value
Mean age	28.9 ± 8.1	24.9 ± 7.0	26.2 ± 4.6	26.5 ± 6.8	0.35 a
Sex
Male	12 (33%)	11 (31%)	13 (36%)	36	0.42 b
Female	5 (26%)	8 (42%)	6 (32%)	19	0.44 b

Results are described as ‘mean ± standard deviation’ or ‘number of participants (%)’.

^aOne-way analysis of variance.

^bChi-square test.