Table 2.
Demographic characteristics of patients suspected with rotator cuff tears
| Characteristics | Training cohort | Internal validation cohort | External validation cohort | ||||||
|---|---|---|---|---|---|---|---|---|---|
| NIRCA (n = 483) | SRCT (n = 345) | p | NIRCA (n = 49) | SRCT (n = 40) | p | NIRCA (n = 28) | SRCT (n = 29) | p | |
| Age (years, mean ± SD) | 49.94 ± 14.20 | 57.28 ± 11.32 | < 0.001 | 51.29 ± 13.22 | 55.50 ± 12.25 | 0.126 | 49.94 ± 14.20 | 57.28 ± 11.32 | 0.408 |
| Sex | 0.013 | 1 | 0.9 | ||||||
| Female | 252 (52.17) | 211 (61.16) | 27 (55.10) | 22 (55.00) | 252 (52.17) | 211 (61.16) | |||
| Male | 231 (47.83) | 134 (38.84) | 22 (44.90) | 18 (45.00) | 231 (47.83) | 134 (38.84) | |||
| Dominant side | < 0.001 | 0.361 | 0.204 | ||||||
| Dominant side | 237 (49.07) | 202 (58.55) | 27 (55.10) | 22 (55.00) | 237 (49.07) | 202 (58.55) | |||
| Non dominant side | 202 (41.82) | 89 (25.80) | 11 (22.45) | 13 (32.50) | 202 (41.82) | 89 (25.80) | |||
| Unknown | 44 (9.11) | 54 (15.65) | 11 (22.45) | 5 (12.50) | 44 (9.11) | 54 (15.65) | |||
| Degree of pain | 0.002 | 0.468 | 0.6 | ||||||
| Mild | 153 (31.68) | 73 (21.16) | 13 (26.53) | 7 (17.50) | 9 (32.14) | 5 (17.24) | |||
| Moderate | 209 (43.27) | 156 (45.22) | 23 (46.94) | 20 (50.00) | 15 (44.12) | 10 (43.48) | |||
| Severe | 52 (10.77) | 41 (11.88) | 4 (8.16) | 7 (17.50) | 5 (14.71) | 3 (13.04) | |||
| Unknown | 69 (14.29) | 75 (21.74) | 9 (18.37) | 6 (15.00) | 8 (23.53) | 5 (21.74) | |||
| History of trauma | < 0.001 | 0.011 | 0.502 | ||||||
| Present | 138 (28.57) | 148 (42.90) | 14 (28.57) | 23 (57.50) | 12 (35.29) | 11 (47.83) | |||
| Absent | 345 (71.43) | 197 (57.10) | 35 (71.43) | 17 (42.50) | 22 (64.71) | 12 (52.17) | |||
| Flex (deg, mean ± SD) | 149.25 ± 34.52 | 150.45 ± 41.46 | 0.652 | 146.33 ± 37.06 | 145.47 ± 49.81 | 0.927 | 140.29 ± 38.41 | 138.65 ± 55.60 | 0.895 |
| Abd (deg, mean ± SD) | 139.82 ± 40.87 | 143.62 ± 46.21 | 0.212 | 136.14 ± 40.61 | 139.30 ± 53.19 | 0.752 | 133.26 ± 39.53 | 131.39 ± 56.22 | 0.883 |
| ER (deg, mean ± SD) | 49.74 ± 23.96 | 58.62 ± 19.86 | < 0.001 | 48.80 ± 22.51 | 58.60 ± 24.45 | 0.052 | 45.62 ± 24.15 | 58.00 ± 26.97 | 0.075 |
| IR (deg, mean ± SD) | 5.43 ± 3.08 | 4.43 ± 2.62 | < 0.001 | 5.12 ± 2.96 | 5.95 ± 8.99 | 0.546 | 6.15 ± 2.58 | 7.13 ± 11.61 | 0.634 |
| ASES (n, mean ± SD) | 60.27 ± 18.16 | 53.84 ± 18.82 | < 0.001 | 56.69 ± 16.93 | 55.75 ± 20.15 | 0.811 | 58.53 ± 14.45 | 57.83 ± 18.71 | 0.874 |
| Constant-Murley (n, mean ± SD) | 70.69 ± 14.40 | 66.24 ± 15.29 | < 0.001 | 69.41 ± 13.92 | 63.08 ± 19.72 | 0.08 | 68.26 ± 12.09 | 61.22 ± 18.81 | 0.09 |
| Quick DASH (n, mean ± SD) | 29.49 ± 15.42 | 33.34 ± 18.91 | 0.001 | 30.61 ± 16.36 | 34.20 ± 20.70 | 0.364 | 32.12 ± 15.66 | 34.70 ± 21.07 | 0.598 |
| SST (n, mean ± SD) | 6.64 ± 2.54 | 6.17 ± 2.88 | 0.015 | 6.14 ± 2.67 | 7.03 ± 5.75 | 0.342 | 5.91 ± 2.37 | 7.39 ± 6.93 | 0.254 |
| UCLA (n, mean ± SD) | 22.22 ± 5.20 | 21.29 ± 5.82 | 0.017 | 22.37 ± 5.68 | 20.65 ± 6.57 | 0.19 | 23.12 ± 4.89 | 20.30 ± 6.96 | 0.078 |