Skip to main content

Table 4 Differential item functioning (DIF) statistics for graded items (N = 386)

From: Warwick Edinburgh Mental Well-Being Scale (WEMWBS): measurement invariance across genders and item response theory examination

Item numbers in:
Group 1 (Men) Group 2 (Women) Total X2 df p X2a df p X2c|a df p
1 1 5.8 5 0.3245 0.3 1 0.5767 5.5 4 0.2396
2 2 6.0 5 0.3077 0.9 1 0.3442 5.1 4 0.2783
3 3 7.3 5 0.1961 0.4 1 0.5370 7.0 4 0.1378
4 4 5.5 5 0.3551 2.2 1 0.1416 3.4 4 0.4993
5 5 24.7 5 0.0002 0.1 1 0.8010 24.7 4 0.0001
6 6 5.1 5 0.4035 1.0 1 0.3260 4.1 4 0.3879
7 7 3.1 5 0.6832 1.2 1 0.2712 1.9 4 0.7548
8 8 8.3 5 0.1393 0.5 1 0.4607 7.8 4 0.1001
9 9 7.9 5 0.1603 0.1 1 0.7383 7.8 4 0.0986
10 10 11.2 5 0.0482 1.7 1 0.1982 9.5 4 0.0497
11 11 2.1 5 0.8329 1.4 1 0.2457 0.8 4 0.9431
12 12 9.0 5 0.1101 2.6 1 0.1090 6.4 4 0.1719
13 13 8.8 5 0.1185 0.5 1 0.4741 8.3 4 0.0826
14 14 6.8 5 0.2343 1.1 1 0.2918 5.7 4 0.2220