Table 4 Subgroup analysis using independent sample t-test to compare TWL & EWL at 6-, 12- and 24-months PO with regards to age (< 45 years, ≥ 45 years) and initial BMI (< 50 kg/m², ≥ 50 kg/m²); represented as mean ± standard deviation (number); bmi = body mass index; ewl = excess weight loss, *=p < 0.05 (statistically significant).

EWL by age

N (39)

N (38)

N (31)

 < 45 years

61.8 ± 17.9

0.18

80.5 ± 18.8

0.54

85.4 ± 19.3

0.007*

 ≥ 45 years

56.1 ± 19.9

76.5 ± 5.4

71.2 ± 18.4

EWL by BMI

N (31)

N (28)

N (22)

 < 50 kg/m²

65.4 ± 17.8

0.001*

86.2 ± 35.7

0.019*

83.8 ± 21.8

0.14

 ≥ 50 kg/m²

50.4 ± 14.6

69.0 ± 16.2

74.0 ± 16.7

TWL by age

N (39)

N (37)

N (31)

 < 45

29.2 ± 8.2

0.17

37.5 ± 8.6

0.1

39.3 ± 9.3

0.03*

 ≥ 45

26.6 ± 7.9

33.9 ± 8.8

33.9 ± 8.2

TWL by BMI

N (31)

N (27)

N (22)

 < 50 kg/m²

30.4 ± 7.9

0.12

37.5 ± 9.2

0.84

39.1 ± 10.0

0.82

 ≥ 50 kg/m²

27.3 ± 7.9

37.0 ± 8.9

39.8 ± 9.8