Table 2.
IRT parameter estimates for the LEIDS-RR-CV for perinatal women
| Item | The third trimester women | The 6-week postpartum women | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Slopeα(SE) | Difficulty | Maximum value of TIF | Mean value of TIFa | Slopeα(SE) | Difficulty | Maximum value of TIF | Mean value of TIFa | |||||||
| β1 (SE) | β2 (SE) | β3 (SE) | β4 (SE) | β1 (SE) | β2 (SE) | β3 (SE) | β4 (SE) | |||||||
| I1 |
1.12 (0.14) |
-1.01 (0.16) |
1.43 (0.19) |
3.40 (0.45) |
4.44 (0.66) |
0.38 | 0.29 |
2.06 (0.18) |
-1.22 (0.12) |
0.06 (0.09) |
1.08 (0.11) |
2.32 (0.21) |
1.22 | 0.77 |
| I8 |
1.27 (0.16) |
-0.48 (0.12) |
1.27 (0.17) |
3.24 (0.41) |
/ | 0.46 | 0.33 |
2.45 (0.21) |
-0.95 (0.10) |
0.13 (0.09) |
1.11 (0.10) |
2.29 (0.20) |
1.70 | 0.96 |
| I11 |
1.65 (0.19) |
0.01 (0.10) |
1.44 (0.15) |
2.58 (0.28) |
3.82 (0.55) |
0.81 | 0.49 |
2.44 (0.21) |
-0.79 (0.09) |
0.14 (0.09) |
1.19 (0.11) |
2.30 (0.20) |
1.70 | 0.93 |
| I24 |
1.46 (0.19) |
0.64 (0.11) |
1.92 (0.22) |
3.09 (0.38) |
4.17 (0.65) |
0.65 | 0.36 |
2.67 (0.24) |
-0.42 (0.08) |
0.20 (0.09) |
1.33 (0.11) |
2.39 (0.22) |
2.11 | 1.00 |
| I25 |
1.03 (0.13) |
-1.23 (0.19) |
0.73 (0.15) |
2.28 (0.29) |
4.17 (0.60) |
0.32 | 0.26 |
1.93 (0.18) |
-1.04 (0.12) |
-0.17 (0.09) |
1.06 (0.11) |
2.31 (0.21) |
1.11 | 0.68 |
| I4 |
1.85 (0.23) |
0.51 (0.09) |
1.92 (0.22) |
3.91 (0.65) |
/ | 0.93 | 0.49 |
2.90 (0.26) |
-0.65 (0.08) |
0.22 (0.09) |
1.30 (0.10) |
2.46 (0.23) |
2.33 | 1.19 |
| I13 |
1.93 (0.26) |
1.00 (0.12) |
2.10 (0.22) |
3.45 (0.49) |
/ | 1.07 | 0.50 |
3.06 (0.27) |
-0.48 (0.08) |
0.30 (0.09) |
1.38 (0.11) |
2.50 (0.24) |
2.61 | 1.26 |
| I16 |
2.29 (0.25) |
0.20 (0.08) |
1.50 (0.14) |
2.39 (0.23) |
/ | 1.52 | 0.67 |
2.89 (0.26) |
-0.62 (0.08) |
0.22 (0.09) |
1.42 (0.11) |
2.38 (0.21) |
2.31 | 1.17 |
| I17 |
2.02 (0.23) |
0.09 (0.09) |
1.44 (0.14) |
2.41 (0.24) |
3.32 (0.44) |
1.22 | 0.67 |
2.51 (0.22) |
-0.79 (0.09) |
0.24 (0.09) |
1.32 (0.11) |
2.91 (0.34) |
1.75 | 1.02 |
| I20 |
2.24 (0.27) |
0.63 (0.09) |
1.94 (0.18) |
2.98 (0.35) |
/ | 1.41 | 0.65 |
2.99 (0.27) |
-0.56 (0.08) |
0.23 (0.08) |
1.42 (0.11) |
2.43 (0.22) |
2.49 | 1.22 |
| I3 |
2.34 (0.25) |
0.02 (0.08) |
1.30 (0.12) |
2.33 (0.21) |
3.12 (0.38) |
1.61 | 0.84 |
3.94 (0.37) |
-0.71 (0.08) |
0.17 (0.08) |
1.27 (0.09) |
2.05 (0.16) |
4.10 | 1.73 |
| I5 |
2.89 (0.39) |
1.00 (0.10) |
1.78 (0.16) |
/ | / | 2.33 | 0.59 |
3.65 (0.33) |
-0.51 (0.08) |
0.34 (0.08) |
1.37 (0.10) |
2.18 (0.18) |
3.57 | 1.56 |
| I12 |
2.44 (0.26) |
0.08 (0.08) |
1.17 (0.11) |
2.11 (0.19) |
3.03 (0.36) |
1.71 | 0.89 |
3.64 (0.33) |
-0.68 (0.08) |
0.27 (0.08) |
1.31 (0.10) |
2.10 (0.17) |
3.56 | 1.57 |
| I23 |
2.55 (0.32) |
0.90 (0.10) |
1.65 (0.15) |
2.71 (0.28) |
/ | 1.90 | 0.72 |
4.71 (0.47) |
-0.08 (0.07) |
0.42 (0.08) |
1.59 (0.11) |
2.16 (0.18) |
6.13 | 1.98 |
| I26 |
2.98 (0.40) |
1.01 (0.10) |
1.86 (0.16) |
2.83 (0.32) |
/ | 2.47 | 0.90 |
4.76 (0.49) |
0.01 (0.07) |
0.41 (0.08) |
1.58 (0.11) |
2.16 (0.18) |
6.52 | 1.94 |
| I2 |
0.94 (0.13) |
-0.74 (0.17) |
1.05 (0.18) |
3.58 (0.51) |
5.88 (1.06) |
0.26 | 0.21 |
2.72 (0.23) |
-0.99 (0.10) |
0.05 (0.08) |
1.02 (0.10) |
2.10 (0.17) |
2.05 | 1.10 |
| I6 |
0.97 (0.13) |
-1.26 (0.21) |
1.02 (0.17) |
3.81 (0.54) |
5.71 (1.01) |
0.27 | 0.23 |
2.94 (0.25) |
-1.02 (0.10) |
0.06 (0.08) |
0.95 (0.09) |
2.13 (0.17) |
2.38 | 1.23 |
| I14 |
0.89 (0.12) |
-1.44 (0.23) |
0.51 (0.15) |
2.64 (0.37) |
4.70 (0.73) |
0.24 | 0.21 |
2.28 (0.20) |
-1.08 (0.11) |
0.01 (0.09) |
0.93 (0.10) |
2.31 (0.20) |
1.51 | 0.88 |
| I22 |
1.00 (0.14) |
-0.78 (0.16) |
1.16 (0.19) |
4.39 (0.67) |
6.22 (1.26) |
0.29 | 0.22 |
2.77 (0.24) |
-0.76 (0.09) |
0.05 (0.08) |
1.12 (0.10) |
2.24 (0.19) |
2.16 | 1.10 |
| I7 |
1.77 (0.18) |
-0.56 (0.11) |
0.80 (0.11) |
2.34 (0.23) |
3.21 (0.38) |
0.94 | 0.59 |
3.04 (0.26) |
-0.98 (0.09) |
0.04 (0.08) |
0.92 (0.09) |
2.33 (0.20) |
2.54 | 1.29 |
| I9 |
2.55 (0.26) |
-0.25 (0.08) |
1.14 (0.11) |
2.10 (0.18) |
2.99 (0.35) |
1.86 | 0.98 |
3.08 (0.27) |
-0.89 (0.09) |
0.11 (0.08) |
1.18 (0.10) |
2.52 (0.24) |
2.54 | 1.33 |
| I10 |
2.25 (0.24) |
-0.10 (0.08) |
1.19 (0.12) |
2.25 (0.21) |
3.46 (0.52) |
1.43 | 0.82 |
3.31 (0.29) |
-0.76 (0.08) |
0.21 (0.08) |
1.14 (0.09) |
2.34 (0.21) |
2.94 | 1.43 |
| I15 |
2.14 (0.22) |
-0.46 (0.09) |
1.05 (0.11) |
2.35 (0.22) |
3.56 (0.54) |
1.27 | 0.79 |
3.75 (0.33) |
-0.74 (0.08) |
0.16 (0.08) |
1.10 (0.09) |
2.17 (0.17) |
3.73 | 1.66 |
| I18 |
2.11 (0.22) |
-0.20 (0.09) |
1.21 (0.12) |
2.17 (0.20) |
3.06 (0.36) |
1.32 | 0.74 |
3.57 (0.32) |
-0.74 (0.08) |
0.18 (0.08) |
1.14 (0.09) |
2.49 (0.25) |
3.39 | 1.59 |
| I19 |
1.91 (0.20) |
-0.70 (0.11) |
1.06(0.12) |
2.51 (0.25) |
/ | 0.99 | 0.60 |
3.66 (0.33) |
-0.81 (0.08) |
0.14 (0.08) |
1.14 (0.09) |
2.34 (0.21) |
3.52 | 1.64 |
| I21 |
2.07 (0.20) |
-0.88 (0.11) |
0.69 (0.10) |
1.96 (0.18) |
2.78 (0.30) |
1.27 | 0.76 |
3.57 (0.31) |
-0.86 (0.09) |
0.09 (0.08) |
1.07 (0.09) |
2.05 (0.16) |
3.38 | 1.56 |
"/"indicates that only four options are selected and the other option is not selected
TIF Test information function
aMean test information function of seven categories, that is, categories − 3, − 2, − 1, 0, 1, 2, 3