Table 3 Distribution of RFI and PFI in cases with unintentional injury and their controls, children 6 to 14 years old, Hei Longjiang, China, 2017–2018
Factors | Case group (n = 424) Number (%) | Control group (n = 1272) Number (%) | Statistics |
|---|---|---|---|
RFI |  |  | F = 85.706** |
 0 | 119 (18.1%) | 608 (47.8%) |  |
 1 | 150 (35.4%) | 454 (35.7%) |  |
 2 | 87 (20.5%) | 175 (13.8%) |  |
 3 | 68 (16.0%) | 35 (2.8%) |  |
PFI |  |  | F = 1.866 |
 0 | 282 (66.5%) | 762 (59.9%) |  |
 1 | 82 (19.3%) | 344 (27.0%) |  |
 2 | 60 (14.2%) | 166 (13.1%) |  |