Screening test properties of the Infant Toddler Checklist (ITC) screen at 18 months compared with developmental diagnosis at 3–5 years (n=488)
| Developmental diagnosis | |||
| ITC screen* | Yes | No | |
| Positive | 8 | 38 | 46 |
| Negative | 18 | 424 | 442 |
| 26 | 462 | 488 | |
| Sensitivity (95% CI), % | 30.8 (14.3 to 51.8) | ||
| Specificity (95% CI), % | 91.8 (88.9 to 94.1) | ||
| False positive rate (95% CI), % | 8.2 (5.8 to 11.3) | ||
| Positive predictive value (95% CI), % | 17.4 (9.9 to 28.8) | ||
| Negative predictive value (95% CI), % | 95.9 (94.8 to 96.8) | ||
| Concern for speech delay | Yes | No | |
| Positive | 6 | 22 | 28 |
| Negative | 20 | 440 | 460 |
| 26 | 462 | 488 | |
| Sensitivity (95% CI), % | 23.1 (9.0 to 43.7) | ||
| Specificity (95% CI), % | 95.2 (92.9 to 97.0) | ||
| False positive rate (95% CI), % | 4.8 (3.0 to 7.2) | ||
| Positive predictive value (95% CI), % | 21.4 (10.8 to 38.1) | ||
| Negative predictive value (95% CI), % | 95.7 (94.7 to 96.5) | ||
| Concern for other communication delays | Yes | No | |
| Positive | 6 | 24 | 30 |
| Negative | 20 | 438 | 458 |
| 26 | 462 | 488 | |
| Sensitivity (95% CI), % | 23.1 (9.0 to 43.7) | ||
| Specificity (95% CI), % | 94.8 (92.4 to 96.7) | ||
| False positive rate (95% CI), % | 5.2 (3.3 to 7.7) | ||
| Positive predictive value (95% CI), % | 20.0 (10.1 to 35.8) | ||
| Negative predictive value (95% CI), % | 95.6 (94.7 to 96.4) | ||
*An ITC screen is positive if there is concern for speech delay and/or other communication delays.