Table 2: BMI groups.

Total sample ( 𝑁 m a x = 4 8 1 ) Women ( 𝑁 m a x = 4 0 4 ) Men ( 𝑁 m a x = 7 7 )
t0t1t2t3t4t0t1t2t3t4t0t1t2t3t4

Underweight (BMI < 18.5)0.00.00.20.20.00.00.00.30.30.00.00.00.00.00.0
Normal range (BMI 18.5 to 24.9)13.124.330.729.627.914.627.034.633.531.65.29.910.07.79.1
Preobese (BMI 25.0 to 29.9)38.343.145.448.943.837.640.042.145.040.441.659.262.970.861.0
Obese class I (BMI 30.0 to 34.9)30.122.917.214.720.028.722.215.814.019.337.726.824.318.523.4
Obese class II (BMI 35.0 to 39.9)12.56.34.54.56.012.46.84.84.75.913.04.22.93.16.5
Obese class III (BMI ≥ 40.0)6.03.42.02.12.46.74.12.42.52.82.60.00.00.00.0

Database: clients who stated at the start of the program that weight reduction was an important goal; 𝑡 0 = start of participation, 𝑡 1 = 4 weeks, 𝑡 2 = 3 months, 𝑡 3 = 6 months, 𝑡 4 = 1 2 months after the start; BMI was categorized according to the World Health Organization’s (WHO) recommendations [24]; data are presented as %.