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Table 4 Analysis of differential item functioning for the 23-item UJA Alzheimer’s care scale

From: Measuring knowledge of Alzheimer’s: development and psychometric testing of the UJA Alzheimer’s Care Scale

  Nursing students/Nursing staff (reference group) N = 653 RNs/ANs and eldercare workers (reference group) N = 283
Item OR (95% CI) DIF* OR (95% CI) DIF
1 1.26 (0.89–1.76)   1.26 (0.62–2.56)  
2 0.25 (0.17–0.36) + 0.23 (0.11–0.46) +
3 1.39 (0.99–1.95)   1.96 (0.98–3.93)  
4 2.52 (1.77–3.59) 1.97 (0.85–4.55)  
5 0.39 (0.24–0.62) + 0.49 (0.13–1.84)  
6 0.57 (0.36–0.85)   0.27 (0.08–0.86)  
7 2.23 (1.54–3.22) 1.31 (0.55–3.11)  
8 0.54 (0.38–0.77)   1.64 (0.82–3.27)  
9 2.29 (1.21–4.33)   0.00 (0–0)  
10 0.52 (0.28–0.98)   0.29 (0.04–2.11)  
11 1.40 (0.89–2.22)   1.19 (0.48–2.98)  
12 3.95 (2.725.72) 2.89 (1.28–6.57)  
13 1.38 (0.97–1.96)   1.26 (0.65–2.45)  
14 0.34 (0.15–0.78)   0.00 (0–0)  
15 2.13 (1.47–3.08)   0.61 (0.30–1.23)  
16 0.58 (0.29–1.14)   0.41 (0.02–7.44)  
17 0.74 (0.43–1.26)   2.34 (0.85–6.40)  
18 0.59 (0.42–0.84)   0.87 (0.45–1.68)  
19 0.68 (0.35–1.31)   2.19 (0.55–8.72)  
20 0.87 (0.60–1.24)   1.09 (0.55–2.16)  
21 0.40 (0.20–0.81)   2.07 (0.36–11.74)  
22 1.47 (0.79–2.76)   2.45 (0.48–12.56)  
23 1.22 (0.83–1.79)   0.72 (0.39–1.35)  
  1. *DIF: Evidence for differential item functioning, items with a significant amount of DIF in bold
  2. + Favouring the focal group. - Favouring the reference group
  3. RNs: Registered Nurses, ANs Assistant Nurses