Diagnostic characteristics of cut-offs for aerobic fitness according to sex and age groups
| 9-Year-old children | 15-Year-old children | |||||||
|---|---|---|---|---|---|---|---|---|
| Cut-offs | 10th | Optimal | 25th | 50th | 10th | Optimal | 25th | 50th |
| Sensitivity (%) | ||||||||
| Girls | 22.4 (16.6–29.1) | 49.7 (42.3–57.2) | 54.6 (47.1–62.0) | 74.9 (67.9–81.0) | 19.3 (13.2–26.7) | 29.7 (22.4–37.8) | 32.4 (24.9–40.7) | 57.9 (49.5–66.1) |
| Boys | 28.8 (22.4–35.9) | 55.4 (47.9–62.7) | 53.3 (45.8–60.6) | 75.5 (68.7–81.6) | 31.0 (23.5–39.3) | 55.6 (47.1–64.0) | 57.0 (48.5–65.3) | 73.9 (65.9–80.9) |
| Specificity (%) | ||||||||
| Girls | 92.3 (90.5–93.9) | 85.9 (83.6–88.0) | 80.5 (77.9–82.9) | 54.6 (51.5–57.7) | 91.5 (89.5–93.2) | 79.9 (77.2–82.5) | 76.2 (73.2–78.9) | 51.3 (48.0–54.6) |
| Boys | 93.3 (91.6–94.8) | 79.3 (76.7–81.8) | 80.1 (77.5–82.5) | 54.6 (51.5–57.7) | 93.4 (91.6–94.9) | 86.4 (84.0–88.6) | 80.0 (77.3–82.6) | 53.7 (50.4–57.0) |
| PPV (%) | ||||||||
| Girls | 34.7 (26.2–44.1) | 39.2 (32.9–45.8) | 33.9 (28.5–39.6) | 23.2 (19.9–26.8) | 26.7 (18.5–36.2) | 19.1 (14.2–24.9) | 17.9 (13.4–23.0) | 16.0 (13.0–19.4) |
| Boys | 43.4 (34.5–52.7) | 32.3 (27.2–37.7) | 32.2 (27.0–37.8) | 22.8 (19.5–26.4) | 42.3 (32.7–52.4) | 41.5 (34.6–48.5) | 30.9 (25.4–36.9) | 20.0 (16.7–23.7) |
| NPV (%) | ||||||||
| Girls | 86.6 (84.4–88.6) | 90.3 (88.2–92.1) | 90.6 (88.5–92.5) | 92.2 (89.8–94.2) | 87.6 (85.4–89.7) | 87.7 (85.2–89.8) | 87.6 (85.1–89.8) | 88.4 (85.4–91.0) |
| Boys | 88.1 (86.0–89.9) | 90.2 (88.9–92.7) | 90.6 (88.5–92.4) | 92.6 (90.3–94.6) | 89.6 (87.5–91.5) | 90.5 (88.3–92.4) | 92.2 (90.2–94.0) | 92.9 (90.4–95.0) |
10th, 25th and 50th percentiles for fitness.
Negative-predictive value (NPV), probability of a negative risk status given a negative test result; positive-predictive value (PPV), probability of a positive risk status given a positive test result; sensitivity, proportion of diseased individuals correctly identified (true-positive rate); specificity, proportion of healthy individuals correctly identified (1 – false-positive rate).