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Table 1 Characteristic of cases with unintentional injury and their controls, children 6 to 14 years old, Hei Longjiang, China, 2017–2018

From: Cumulative effect of risk and protective factors on unintentional injury for Chinese rural children: a nested case-control study

Characteristics Case group (n = 424) Control group (n = 1272) Statistics
Age (year) M (SD) 10.93 (1.76) 11.07 (2.02) t = 1.353
Gender (%)    χ2 = 2.216
Boy 213 (50.2%) 586 (46.1%)  
Girl 211 (49.8%) 686 (53.9%)  
Left behind children (%) 220 (51.9%) 453 (35.6%) χ2 = 35.185**
Primary caregiver (%)    F = 35.255**
 Mother 157 (37.0%) 908 (71.4%)  
 Father 21 (5.0%) 115 (9.0%)  
 Grandparents 235 (55.4%) 235 (18.5%)  
 Baby sister or others 11 (2.6%) 14 (1.1%)  
Primary caregiver’s education    F = 6.008*
 Illiteracy 27 (6.4%) 39 (3.1%)  
 Elementary school 100 (23.6%) 278 (21.9%)  
 Junior high school 233 (54.9%) 754 (59.3%)  
 Senior high school 57 (13.4%) 152 (11.9%)  
 Above college 7 (1.7%) 49 (3.9%)  
Health of primary caregiver 8.68 (2.47) 9.14 (3.99) t = 2.232*
Mother’s age 36.56 (6.00) 37.51 (6.00) t = 2.977*
Mother’s education    F = 0.050
 Illiteracy 21 (5.0%) 56 (4.4%)  
 Elementary school 81 (19.1%) 291 (22.9%)  
 Junior high school 255 (60.1%) 711 (55.9%)  
 Senior high school 53 (12.5%) 164 (12.9%)  
 Above college 14 (3.3%) 50 (3.9%)  
Father’s age 38.19 (6.07) 39.18 (5.60) t = 2.944*
Father’s education    F = 110.423**
 Illiteracy 5 (1.2%) 3 (0.2%)  
 Elementary school 87 (20.5%) 30 (2.3%)  
 Junior high school 275 (64.9%) 953 (74.9%)  
 Senior high school 46 (10.8%) 220 (17.3%)  
 Above college 11 (2.6%) 66 (5.2%)  
Household income (per person per month in yuan)    F = 7.892**
  < 1000 RMB 50 (11.8%) 83 (6.5%)  
 1000–3000 RMB 241 (56.8%) 442 (34.7%)  
 3001–5000 RMB 97 (22.9%) 569 (44.7%)  
  > 5000 RMB 33 (7.8%) 178 (14.0%)  
  1. *p < 0.05 ** p < 0.001