Table 3. Pre and post imputation descriptives of all study variables.
| Variable | Pre imputation | Post imputation (N = 288)1 | NA2 (%) | ||
| Mean (SD) | N (%) | Mean (SD) | N (%) | ||
| Age3 (years) | 9.59 (1.93) | 9.59 (1.92) | 0 | ||
| Hg (µg/g) | 0.13 (0.11) | 0.13 (0.10) | 36.1 | ||
| Sex: | 0 | ||||
| Male | 156 (54.2) | 156 (54.2) | |||
| Female | 132 (45.8) | 132 (45.8) | |||
| Mother in contact withHg during pregnancy: | 12.5 | ||||
| No | 176 (69.8) | 197 (68.4) | |||
| Yes | 76 (30.2) | 91 (31.6) | |||
| Father’s occupation3: | 18.8 | ||||
| Industrial gold mine | 9 (3.8) | 19 (6.6) | |||
| Industrial copper mine | 42 (17.9) | 54 (18.9) | |||
| Traditional gold mining | 44 (18.8) | 55 (19.0) | |||
| Outside mining | 139 (59.4) | 160 (55.6) | |||
| Hg exposure in householdand child playing inside: | 17.7 | ||||
| No | 211 (89.0) | 253 (87.8) | |||
| Yes | 26 (11.0) | 35 (12.2) | |||
| Fish consumption: | 4.2 | ||||
| <1 times/week | 85 (30.8) | 89 (30.9) | |||
| 1–4 times/week | 131 (47.5) | 136 (47.2) | |||
| >4 times/week | 60 (21.74) | 63 (21.9) | |||
| Number of siblings3: | 5.9 | ||||
| 0 | 26 (9.6) | 29 (10.1) | |||
| 1–2 | 170 (62.7) | 176 (61.1) | |||
| >2 | 75 (27.7) | 83 (28.8) | |||
| Hours spent indoors3: | 22.2 | ||||
| <3 hours/day | 23 (10.3) | 33 (11.8) | |||
| 3–6 hours/day | 49 (21.9) | 67 (26.7) | |||
| >6 hours/day | 152 (67.8) | 189 (61.5) | |||
| Mother employed3: | 8.3 | ||||
| No | 191 (72.4) | 209 (72.6) | |||
| Yes | 73 (27.6) | 79 (27.4) | |||
| Father employed3: | 13.5 | ||||
| No | 23 (9.2) | 30 (10.4) | |||
| Yes | 226 (90.8) | 258 (89.6) | |||
| Somebody smoking in household3: | 10.1 | ||||
| No | 188 (72.6) | 209 (72.6) | |||
| Yes | 71 (27.4) | 79 (27.4) | |||
1
Descriptives for variables post imputation were calculated using Rubin’s rules.
2
NA = missing value. Column displays percentage of missing values in variable.
3
Variable additionally included in imputation model to improve missing at random assumption.