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Table 5 Use of interventions by cases and controls with results of multiple logistic regression in groups by theme shown with area under the ROC curve for each group

From: Risk factors for malaria in high incidence areas of Viet Nam: a case–control study

Theme Variable Cases Controls OR p value
Malaria history How long been unwell (days)* 3 (2–4) 1 (0–2) 2.576 (2.346–2.841) < 0.0001
  Had recorded fever 143 (14.3%) 47 (4.7%) 2.172 (1.480–3.231) < 0.0001
  Times had malaria in past 1 year* 0 (0–1) 0 (0–0) 3.779 (2.873–5.031) < 0.0001
  Times people in your house 0 (0–0) 0 (0–0) 0.9848 (0.8096–1.196) 0.8776
had malaria in past year*
  Area under ROC    0.8395 (0.8225–0.8565) < 0.0001
Treatment Had prior treatment 366 (36.6%) 106 (10.6%) 4.869 (3.847–6.206) < 0.0001
  Finished treatment 350 (95.6%) 99 (93.4%)   
  Vomited treatment 36 (9.8%) 19 (17.9%)   
  Area under ROC    0.63 (0.6056–0.6544) < 0.0001
Prior healthcare Government health center 104 (10.4%) 36 (3.6%) 3.748 (2.536–5.654) < 0.0001
for this illness Any medical care 368 (36.8%) 212 (21.2%) 0.9816 (0.4626–1.984) 0.9597
  Government hospital 10 (1.0%) 2 (0.2%) 5.744 (1.287–41.41) 0.0394
  Pharmacy 310 (31.0%) 184 (18.4%) 2.38 (1.171–5.089) 0.0197
  Private clinic 54 (5.4%) 13 (1.3%) 5.66 (2.322–14.76) 0.0002
  Area under ROC    0.6283 (0.6039–0.6526) < 0.0001
LLIN Household has LLIN 908 (90.8%) 911 (91.1%)   
  Per person* 1 (1–1) 1 (1–1) 0.2143 (0.06193–0.6692) 0.0102
  Use 729 (80.0%) 911 (92.4%)   
  Age (months)* 7 (6–12) 10 (6–15.5) 0.9748 (0.9628–0.9865) < 0.0001
  Last treated (months)* 6 (6–11) 8 (6–12) 0.9935 (0.9832–1.003) 0.2067
  Has holes 10 (1.1%) 6 (0.7%) 2.321 (0.8358–7.007) 0.1133
  Area under ROC    0.6042 (0.5752–0.6332) < 0.0001
House Size* 5 (4–6) 5 (4–6) 0.9302 (0.8764–0.9837) 0.0162
  Sealed to mosquitoes 8 (0.9%) 7 (0.7%) 1.199 (0.4280–3.437) 0.7274
  Have AC 6 (0.6%) 11 (1.1%) 0.5445 (0.1864–1.442) 0.2344
  Area under ROC    0.5439 (0.5178–0.5701) 0.0011
Personal Use coil 152 (15.2%) 173 (17.3%) 2.392 (1.763–3.265) < 0.0001
protection Use repellent 198 (19.8%) 382 (38.2%) 0.622 (0.4682–0.8260) 0.001
  Use plug-in 181 (18.1%) 425 (42.5%) 0.2842 (0.2138–0.3753) < 0.0001
  Area under ROC    0.6347 (0.6103–0.6591) < 0.0001
  Use LLIN    0.4308 (0.3195–0.576) < 0.0001
  Use coil    2.396 (1.758–3.283) < 0.0001
  Use repellent    0.7364 (0.5514–0.9836) 0.0381
  Use plug-in    0.305 (0.2281–0.4051) < 0.0001
  Area under ROC    0.656 (0.6318–0.6803) < 0.0001
  1. Where no odds ratio is shown this indicates that the logistic regression could not be fit for this variable in combination with any others in the group
  2. *Median (IQR)