Table 3 Unidimensional 5-item partial credit model scale reliability and properties (Reaching Married Adolescents Study, 2016–2019, n = 559)
Items | Item response theory | CTT | |||
|---|---|---|---|---|---|
(EAP reliability: 0.740) | (Cronbach's α: 0.820) | ||||
Item difficulty (SE) | Weighted mean square error fit (CI) | DIF: Zarma (vs. Hausa) | Point-biserial (response 0, 1, 2) | Item-total correlations | |
1. Use family planning | 0.594 (0.074) | 0.88 (0.86, 1.14) | − 0.044 | − 0.65, 0.01, 0.68 | 0.85 |
2. Force sex | 2.423 (0.093) | 1.20 (0.84, 1.16) | − 0.230 | − 0.43, 0.18, 0.40 | 0.62 |
3. Refuse sex | 1.816 (0.082) | 0.93 (0.86, 1.14) | − 0.026 | − 0.64, 0.23, 0.59 | 0.80 |
4. Argue | 1.459 (0.077) | 1.11 (0.86, 1.14) | 0.248 | − 0.58, 0.11, 0.57 | 0.77 |
5. Go out | 1.411 (0.077) | 0.93 (0.87, 1.13) | − 0.008 | − 0.67, 0.20, 0.62 | 0.82 |
Variance (SE): 3.741 (0.224) | |||||