Table 2 Missing data handling during development and external validation
|  | Overall N = 241 | Development only n = 182 | External validation only n = 59 |
|---|---|---|---|
Missing data reporting | |||
 None | 178 (74.2%) | 138 (75.8%) | 40 (67.8%) |
 Overall | 40 (16.7%) | 32 (17.6%) | 8 (13.6%) |
 Detaila | 23 (9.6%) | 12 (6.6%) | 11 (18.6%) |
Missing data method | |||
 Complete case | 161 (67.1%) | 129 (70.9%) | 32 (54.2%) |
 Multiple imputation | 6 (2.5%) | 6 (3.3%) | 0 |
 Unclear | 73 (30.4%) | 47 (25.8%) | 27 (45.8%) |
 Assumed mechanism of missingness reported | 1 (0.4%) | 1 (0.5%) | 0 |