Table 5.
Univariate logistic models showing the chances of getting head lice (OR, CI) in a given period if head lice were experienced in another
| Explanatory variable | |||||
|---|---|---|---|---|---|
| Response variable | Reported history | Screening | Period 1a | Period 2a | Period 3 |
| Screening | 3.7 (2.0–7.0)*** | – | – | – | – |
| (2509) | |||||
| Period 1a | 1.9 (1.1–3.3)* | 13.8 (5.8–32.8)*** | – | – | – |
| (1471) | (1874) | ||||
| Period 2a | 2.5 (1.4–4.5)*** | 9.1 (3.6–23.5)*** | 7.6 (3.7–15.5)*** | – | – |
| (1471) | (1874) | (1875) | |||
| Period 3 | 1.6 (1.0–2.5)* | 2.1 (0.6–7.3) | 1.1 (0.2–4.5) | 2.7 (0.9–7.9) | – |
| (1343) | (1750) | (1144) | (1144) | ||
| Period 4 | 1.0 (0.6–1.7) | 4.5 (1.8–11.4)** | 2.0 (0.6–6.7) | 2.4 (1.1–5.4)* | 10.0 (4.9–20.1)*** |
| (1090) | (1392) | (926) | (926) | (1038) | |
Period 4 and reported history represent the most distant measures in time. N for each analysis is given in parenthesis below the statistics. ORs in bold indicate significantb (<0.05) interactions.
aData from Period 1 was collected simultaneously.
b P-values: *0.01–0.05, **0.01–0.001, ***<0.001.