Table 2 GEE marginal expectation model of WHOQOL-BREF domains (cell values are beta regression coefficients ± standard error)

Gender

0.89 ± 0.19

−1.16 ± 0.31

1.22 ± 0.20

0.98 ± 0.33

Age

11.79 ± 0.91

3.81 ± 1.01

−1.41 ± 1.09 ns

1.65 ± 1.25 ns

Time

−0.76 ± 0.54 ns

2.96 ± 0.52

2.93 ± 0.60

1.34 ± 0.62

Education

2.74 ± 0.96

5.48 ± 1.25

−3.49 ± 1.16 ns

−2.22 ± 1.30 ns

Marital status

0.12 ± 0.1 ns

0.07 ± 0.22 ns

−0.18 ± 0.11 ns

−0.28 ± 0.20 ns

Time * Age

0.32 ± 0.14

−0.95 ± 0.15

−0.28 ± 0.17

−0.11 ± 0.16 ns

Time * Education

0.54 ± 0.15

0.57 ± 0.17

−0.68 ± 0.19

−0.05 ± 0.18 ns

GEE model constant

57.55 ± 0.85

60.18 ± 1.12

70.68 ± 1.03

61.56 ± 1.16