Table 1 Baseline characteristics
Characteristics | FAHSYSU validation (n = 2382) | External validation (n = 6806) | ||||||
|---|---|---|---|---|---|---|---|---|
Training (n = 1727) | Verification (n = 294) | Testing (n = 361) | SYMSYSU (n = 2242) | NHSMU (n = 1852) | FAHSU (n = 1491) | TAHSYSU (n = 528) | SAHSYSU (n = 693) | |
Age(years), mean(range) | 51·0 (18–93) | 52·9 (20–86) | 53·7 (19–86) | 44·8 (18–90) | 42·4 (18–88) | 44·6 (18–78) | 43·7 (18–81) | 44·2 (18–86) |
Sex | ||||||||
 Male | 1158 (67·1%) | 216 (73·5%) | 273 (75·6%) | 1181 (52·7%) | 1008 (54·4%) | 741 (49·7%) | 282 (53·4%) | 345 (49·8%) |
 Female | 569 (32·9%) | 78 (26·5%) | 88 (24·4%) | 1061 (47·3%) | 844 (45·6%) | 750 (50·3%) | 246 (43·6%) | 348 (50·2%) |
Laryngeal cancer | 453 (26·2%) | 97 (33·0%) | 121 (33·5%) | 73 (3·3%) | 57 (3·1%) | 32 (2·1%) | 34 (6·4%) | 39 (5·7%) |
Hypopharyngeal cancer | 105 (6·1%) | 24 (8·2%) | 28 (7·8%) | 21 (0·9%) | 11 (0·6%) | 7 (0.5%) | 8 (1·5%) | 9 (1·3%) |
Benign disease | 443 (25·7%) | 49 (16·6%) | 63 (17·4%) | 178 (7·9%) | 116 (6·3%) | 63 (4·2%) | 48 (9·1%) | 57 (8·2%) |
No disease | 726 (42·0%) | 124 (42·2%) | 149 (41·3%) | 1970 (87·9%) | 1668 (90·0%) | 1389 (93·2%) | 438 (83·0%) | 588 (84·8%) |