Table 1.

Demographic characteristics of the study subjects (n = 131)

Characteristic	Group 1 (n = 33)	Group 2 (n = 33)	Group 3 (n = 32)	Group 4 (n = 33)
Origin, n (%)
Caucasian	6 (18.2)	6 (18.2)	5 (15.6)	8 (24.2)
African	27 (81.8)	27 (81.8)	27 (84.4)	25 75.8)
Age (years)	30.2 ± 10.89	31.1 ± 11.12	28.4 ± 9.80	30.1 ± 11.06
BMI (kg m–2)	22.33 ± 3.727	22.01 ± 3.237	22.61 ± 3.310	22.71 ± 3.180
Weight (kg)	67.29 ± 11.712	66.08 ± 11.524	67.59 ± 11.528	68.83 ± 11.250
Height (cm)	173.57 ± 6.329	173.02 ± 6.479	172.69 ± 6.960	173.91 ± 5.891

Age, BMI, weight and height are listed as mean ± SD. BMI, body mass index.