Table 1 Participants demographics of three sample groups
Characteristic | First sample (IPEQ-1: n = 149; IPEQ-2: n = 130) | Second sample (IPEQ-1: n = 423; IPEQ-2: n = 419) | Third sample (IPEQ-1: n = 547; IPEQ-2: n = 523) | |||
|---|---|---|---|---|---|---|
IPEQ-1 n (%) | IPEQ-2 n (%) | IPEQ-1 n (%) | IPEQ-2 n (%) | IPEQ-1 n (%) | IPEQ-2 n (%) | |
Age | ||||||
 M ± SD | 49.47 ± 15.16 | 49.55 ± 15.35 | 50.93 ± 17.84 | 50.88 ± 17.89 | 51.43 ± 16.92 | 51.34 ± 16.95 |
 Missing | 2 (1.34) | 2 (1.54) | 5 (1.18) | 7 (1.67) | 8 (1.46) | 8 (1.53) |
Gender | ||||||
 Male | 79 (53.02) | 69 (53.08) | 212 (50.12) | 208 (49.64) | 261 (47.71) | 250 (47.80) |
 Female | 66 (44.30) | 57 (43.85) | 207 (48.94) | 207 (49.40) | 282 (51.55) | 269 (51.43) |
 Missing | 4 (2.68) | 4 (3.08) | 4 (0.95) | 4 (0.95) | 4 (0.73) | 4 (0.76) |
Marital status | ||||||
 Single | 16 (10.74) | 14 (10.77) | 48 (11.35) | 48 (11.46) | 54 (9.87) | 51 (9.75) |
 Married/cohabitating | 126 (84.56) | 109 (83.85) | 345 (81.56) | 342 (81.62) | 469 (85.74) | 449 (85.85) |
 Divorced/separated/widowed | 3 (2.01) | 3 (2.31) | 24 (5.67) | 23 (5.49) | 15 (2.74) | 15 (2.87) |
 Missing | 4 (2.68) | 4 (3.08) | 6 (1.42) | 6 (1.43) | 9 (1.65) | 8 (1.53) |
Education level | ||||||
 Junior school or less | 56 (37.58) | 48 (36.92) | 179 (42.32) | 178 (42.48) | 218 (39.85) | 206 (39.39) |
 Senior/polytechnic school | 40 (26.85) | 32 (24.62) | 114 (26.95) | 111 (26.49) | 161 (29.43) | 155 (29.64) |
 College | 37 (24.83) | 34 (26.15) | 112 (26.48) | 112 (26.73) | 134 (24.50) | 130 (24.86) |
 Graduate school | 8 (5.37) | 8 (6.15) | 9 (2.13) | 9 (2.15) | 18 (3.29) | 17 (3.25) |
 Missing | 8 (5.37) | 8 (6.15) | 9 (2.13) | 9 (2.15) | 16 (2.93) | 15 (2.87) |