The capacity of computer-assisted self-administered interviewing (CASI) to correctly classify menarcheal status using face-to-face interviewing (FFI) as a reference
| Age at investigation M (SD)(years) | Menarche attainment n (%) | Time since menarche M (SD) (years) | Sensitivity | Specificity | PPV | NPV | Accuracy | ||
| FFI | CASI | ||||||||
| Total (n = 3478)* | 14.3 (2.46) | 2538 (73.0) | 2496 (71.2) | 2.81 (1.75) | 0.97 | 0.80 | 0.99 | 0.96 | 0.92 |
| Location | |||||||||
| Urban (n=1863) | 14.3 (2.51) | 1389 (74.6) | 1364 (73.2) | 2.96 (1.80) | 0.97 | 0.88 | 0.99 | 0.96 | 0.95 |
| Rural (n=1615) | 14.3 (2.40) | 1149 (71.2) | 1132 (70.1) | 2.63 (1.68) | 0.97 | 0.71 | 0.99 | 0.97 | 0.90 |
| Grades | |||||||||
| G5 (n=496) | 10.9 (0.66) | 52 (10.5) | 53 (10.7) | 0.65 (0.71) | 0.77 | 0.73 | 0.75 | 0.98 | 0.73 |
| G6 (n=484) | 12.0 (0.60) | 182 (37.6) | 176 (36.4) | 0.80 (0.57) | 0.91 | 0.83 | 0.94 | 0.97 | 0.86 |
| G7 (n=507) | 13.0 (0.63) | 364 (71.8) | 354 (69.8) | 1.22 (0.79) | 0.95 | 0.90 | 0.98 | 0.96 | 0.94 |
| G8 (n=440) | 14.0 (0.68) | 404 (91.8) | 394 (89.6) | 1.74 (0.86) | 0.97 | 0.92 | 0.99 | 0.92 | 0.97 |
| G9 (n=429) | 15.1 (0.69) | 419 (97.7) | 411 (95.8) | 2.58 (1.03) | 0.98 | 0.90 | 1.00 | 0.90 | 0.98 |
| G10 (n=388) | 16.1 (0.73) | 38 4 (99.0) | 383 (98.7) | 3.23 (1.09) | 0.99 | 0.50 | 0.99 | 0.50 | 0.99 |
| G11 (n=346) | 17.1 (0.71) | 346 (100.0) | 342 (98.8) | 4.02 (1.16) | 0.99 | – | – | – | – |
| G12 (n=388) | 18.3 (0.71) | 387 (99.7) | 383 (98.7) | 5.18 (1.34) | 0.99 | 1.00 | 1.00 | 0.25 | 0.99 |
| Awareness in reproductive health | |||||||||
| <25% (n=838) | 13.0 (1.86) | 481 (57.4) | 445 (53.1) | 1.84 (1.23) | 0.91 | 0.71 | 0.98 | 0.96 | 0.82 |
| 25%–50% (n=1552) | 14.2 (2.48) | 1130 (72.8) | 1127 (72.6) | 2.73 (1.70) | 0.98 | 0.82 | 0.98 | 0.96 | 0.93 |
| >50% (n=1088) | 15.3 (2.44) | 927 (85.2) | 924 (84.9) | 3.36 (1.80) | 0.99 | 0.93 | 1.00 | 0.96 | 0.98 |
| Tanner breast stage | |||||||||
| B1 (n=223) | 11.1 (0.79) | 2 (0.90) | 9 (4.04) | 0.61 (0.48) | 1.00 | 0.77 | 0.22 | 1.00 | 0.78 |
| B2 (n=364) | 11.6 (0.94) | 59 (16.2) | 63 (17.31) | 0.84 (0.50) | 0.92 | 0.77 | 0.86 | 0.99 | 0.80 |
| B3 (n=818) | 12.7 (1.33) | 472 (57.7) | 452 (55.3) | 1.28 (0.92) | 0.93 | 0.84 | 0.97 | 0.94 | 0.89 |
| B4 (n=976) | 14.5 (1.62) | 910 (93.2) | 889 (91.1) | 2.29 (1.28) | 0.97 | 0.80 | 0.99 | 0.92 | 0.96 |
| B5 (n=1095) | 16.9 (1.54) | 1093 (99.8) | 1081 (98.7) | 3.95 (1.62) | 0.99 | 0.50 | 1.00 | 0.14 | 0.98 |
*203 out of the 3478 girls (5.84%) were unclear about their status of menarche by CASI.
M, mean; NPV, negative predictive value; PPV, positive predictive value.