Table 1.

Descriptive statistics of subjects' demographic characteristics

Characteristic	Subjects with LBP (n = 18)	Asymptomatic subjects (n = 15)	p-value
Mean age (SD)	33.9 (8.2)	38.9 (8.0)	0.085
Sex (%)
Male	4 (22.2%)	9 (60%)
Female	14 (77.8%)	6 (40%)	0.03
Mean height (SD)	161.4 cm (7.9)	163.4 cm (6.9)	0.448
Mean body weight (SD)	53.5 kg (9.5)	58.5 kg (10.2)	0.157
Mean years of working experience	8.5 (4.8)	12.0 (5.6)	0.061
Average number of lifts per shift	16.5(2.9)	15.3(2.3)	0.20
Professions	Teacher = 11 Health care professional = 5 Teaching assistant = 2	Teacher = 10 Health care professional = 4 Teaching assistant = 1