Table 4.
Logistic regression models of factors associated with low or poor adherence*
| Factor | Number of patients | Model 1 (NA based on categories NA I, NA II) | Model 2 (NA based on Model 1 + NA III) | Model 3 (NA based on Model 2 + NA IVa/IVb, NA V) | |||
|---|---|---|---|---|---|---|---|
| OR (95% CI)† | p value | OR (95% CI)† | p value | OR (95% CI)† | p value | ||
| Rehabilitation form | |||||||
| Inpatient | 958 | 1.00‡ | 1.00‡ | 1.00‡ | |||
| Outpatient | 357 | 4.72 (3.24–6.88) | < 0.001 | 8.10 (5.80–11.67) | < 0.001 | 6.83 (4.93–9.45) | < 0.001 |
| Duration of linking (days) | 1315 | 1.05 (1.02–1.08) | 0.002 | 1.04 (1.01–1.07) | 0.011 | 1.05 (1.02–1.08) | < 0.001 |
| Fear of thrombosis | |||||||
| No | 1087 | 1.00‡ | |||||
| Yes | 228 | 0.58 (0.35–0.98) | 0.041 | ||||
| Prevention of thrombosis by drugs§ | |||||||
| No | 38 | 1.00‡ | |||||
| Yes | 1277 | 0.38 (0.17–0.86) | 0.020 | ||||
| p Value (Hosmer and Lemeshow’s goodness of fit chi square statistic) | 0.254 | 0.020 | 0.767 | ||||
* A backward elimination method was used retaining all variables considered to be potentially important; variables with p < 0.1 remained in the final models whereas variables with p > 0.1 were removed in the stepwise backward process; †odds ratio (OR) and 95% confidence interval (CI) derived from the three logistic models adjusting for age, gender, living circumstances, education, and clinic; ‡reference group; §patients were asked how much they believe drugs protect from thrombosis.