Risk factors Categories IPIs Total no. (%) Negative no. (%) Positive no. (%) COR, 95% CI AOR, 95% CI School Gibtsawit Primary School 60 (15.7) 25 (41.7) 35 (58.3) 1.52 (0.712, 3.23) 0.024 1.35 (0.602, 3.028) 0.11 Enbosa Maseria Primary School 50 (13.1) 26 (52) 24 (48) 1 1 Wagira Primary School 58 (15.2) 24 (41.4) 34 (58.6) 1.535 (0.716, 3.289) 0.112 (0.012, 1.1) Mirafe Mariam Primary School 109 (28.5) 42 (38.5) 67 (61.5) 1.73 (0.9, 3.4) 0.096 (0.01, 0.8) Korata Primary School 105 (27.5) 27 (25.7) 78 (74.3) 3.13 (1.544, 6.344) — Family size ≤5 69 (18.1) 34 (49.3) 35 (50.7) 1 0.030 1 0.049 >5 313 (81.9) 110 (35.1) 203 (64.9) 1.8 (1.1, 3.03) 1.8 (1.004, 3.13) Mode of school waste disposal Burry and firing 119 (31.2) 60 (50.4) 59 (49.6) 1 0.001 1 0.011 Open field 263 (68.8) 84 (31.9) 179 (68.1) 2.167 (1.39, 3.375) 15.88 (1.91, 132.1) Knowledge of IPIs Yes 299 (78.3) 100 (33.9) 199 (67.5) 2.245 (1.371, 3.68) 0.001 1.8 (1.1, 3.2) 0.027 No 83 (21.7) 44 (50.6) 39 (44.8) 1 1 Playing with soil No 208 (54.5) 84 (40.4) 124 (59.6) 1 0.24 1 0.148 Yes 174 (45.5) 60 (34.5) 114 (65.5) 1.287 (0.85, 1.95) 1.5 (0.87, 2.45) Suckling’s fingers No 130 (34.0) 55 (42.3) 75 (57.7) 1 0.18 1 0.963 Yes 252 (66.0) 89 (35.3) 163 (64.7) 1.343 (0.871, 2.07) 1.01 (0.59, 1.7) School toilet function No 188 (49.2) 57 (30.3) 131 (69.7) 1.869 (1.23, 2.845) 0.004 1.4 (0.825, 2.225) 0.230 Yes 194 (50.8) 87 (44.8) 107 (55.2) 1 1 School water access No 105 (27.5) 27 (25.7) 78 (74.3) 2.112 (1.283, 3.5) 0.003 5.3 (0.55, 50) 0.146 Yes 277 (72.5) 117 (42.2) 160 (57.8) 1 1 Household toilet No 230 (60.2) 81 (35.2) 149 (64.8) 1.302 (0.9, 1.9) 0.219 1.4 (0.9, 2.204) 0.178 Yes 152 (39.8) 63 (41.4) 89 (58.6) 1 1
