Table 1: Age, physical exercise, obesity, and muscular endurance data of participants stratified by obesity categories.

Total ( )Non-obese
(BMI < 30 kg/m2) ( )
Obese (BMI ≥ 30 kg/m2) ( ) value

Age (y)35.7 ± 9.434.1 ± 9.639.7 ± 7.70.013
Years as career firefighter9.7 ± 8.99.1 ± 9.011.2 ± 8.80.341
Any exercise (d/wk)3.2 ± 1.33.3 ± 1.32.9 ± 1.20.139
Body height (cm)178.2 ± 7.7177.4 ± 7.0180.2 ± 9.00.130
Body mass (kg)89.5 ± 14.882.9 ± 9.6105.7 ± 12.7<0.001
BMI (kg/m2)28.1 ± 3.726.3 ± 2.432.5 ± 2.3<0.001
Body fat (%)22.5 ± 8.319.5 ± 7.229.8 ± 6.0<0.001
Fat mass (kg)20.9 ± 10.0 16.6 ± 7.331.6 ± 7.2<0.001
Fat-free mass (kg)68.6 ± 8.566.3 ± 6.274.2 ± 10.70.002
Back muscular endurance(s)90.5 ± 26.498.2 ± 23.071.3 ± 24.6<0.001*
Core muscular endurance(s)140.2 ± 56.4151.9 ± 56.6111.5 ± 45.40.001*

Values reported as raw mean ± standard deviation. Statistical comparisons were made between the nonobese and obese groups. Any exercise: self-reported days per week of any physical over the past three months; BMI: body mass index.
* values after covaring for age.