Table 2 Item difficulty and discrimination for the knowledge index
Item | Item | 7 item model | 6 item model* | ||
|---|---|---|---|---|---|
No. | Item discrimination (SE) | Item difficulty (SE) | Item discrimination (SE) | Item difficulty (SE) | |
K1 | When to participate in the MSP (No breast complaints/ Breast complaints/ In both cases) | 0.267 (0.036) | 4.040 (0.520) | 0.256 (0.036) | 4.202 (0.560) |
K2 | Number of women receiving a positive result (1-20 of 200/ 21-50 of 200/ 51-100 of 200/ 101-200 of 200) | 0.428 (0.038) | 2.411 (0.192) | 0.403 (0.037) | 2.537 (0.212) |
K3 | Positive MSP result means breast cancer (Yes/ No) | 0.810 (0.060) | -0.782 (0.046) | 0.805 (0.061) | -0.785 (0.047) |
K4 | MSP discovers every breast cancer (Yes/ No) | 0.710 (0.049) | -0.126 (0.030) | 0.812 (0.062) | -0.115 (0.028) |
K5 | More likely to get the diagnosis breast cancer (Women participating in the MSP/ Women not participating in the MSP/ Both the same) | 0.202 (0.031) | 4.442 (0.671) | 0.120 (0.030) | 7.341 (1.836) |
K6 | More likely to die of breast cancer (Women participating in the MSP/ Women not participating in the MSP/ Both the same) | 0.208 (0.028) | -1.505 (0.209) | - | - |
K7 | Existence of overtreatment (Yes/ No) | 0.450 (0.033) | 0.623 (0.057) | 0.433 (0.033) | 0.644 (0.060) |