Distribution and multivariate odds ratios of patient factors for association with a preventable in-hospital adverse event (AE)†
| Patient factors | AE (n=335) | No AE (n=5659) | Multivariate odds ratio (95% CI)¶ |
|---|---|---|---|
| Values are n (%). Percentages have been adjusted to account for stratified cluster sample design. | |||
| * p<0.05. | |||
| †Incident recorded by healthcare professional during sampled admission and later assessed as adverse event by study physician reviewer; any evidence of healthcare management causation; occurred inside a public hospital; and any evidence of preventability. | |||
| ‡NZDep96 decile is an area based index of social deprivation derived from patient domicile code; 74 cases had missing data. | |||
| §Major diagnostic category derived from AN-DRG 3.1. | |||
| ¶Odds ratios were estimated using multiple logistic regression, adjusted to account for the stratified cluster sample design, with all patient factors in the model. Each odds ratio is adjusted for the effect of the other patient factors. | |||
| Age | |||
| 0–29 years (reference) | 76 (23.1) | 2198 (38.6) | 1.00 |
| 30–64 years | 123 (36.9) | 1861 (33.2) | 1.80 (1.42 to 2.29)* |
| 65+ years | 136 (40.0) | 1600 (28.2) | 2.43 (1.86 to 3.17)* |
| Sex | |||
| Female (reference) | 150 (44.5) | 2547 (45.0) | 1.00 |
| Male | 185 (55.5) | 3112 (55.0) | 0.89 (0.79 to 1.0) |
| Ethnicity | |||
| European and others (reference) | 260 (77.4) | 4579 (81.0) | 1.00 |
| Maori | 59 (17.4) | 873 (15.0) | 1.57 (1.22 to 2.02)* |
| Pacific | 16 (5.2) | 207 (4.0) | 1.77 (1.03 to 3.06)* |
| Area deprivation score‡ | |||
| Low (deciles 1 to 5) (reference) | 118 (35.0) | 2109 (37.7) | 1.00 |
| High (deciles 6 to 10) | 217 (65.0) | 3550 (62.3) | 1.07 (0.86 to 1.34) |
| Principal diagnosis§ (categories >5% of AEs) | |||
| Other 19 MDCs (reference) | 134 (40.4) | 2128 (37.8) | 1.00 |
| Musculoskeletal system | 61 (17.7) | 575 (10.0) | 1.67 (1.13 to 2.45)* |
| Digestive system | 50 (14.5) | 557 (9.9) | 1.41 (0.94 to 2.11) |
| Circulatory system | 40 (11.7) | 758 (13.4) | 0.68 (0.53 to 0.88)* |
| Pregnancy/newborns | 27 (8.9) | 1131 (19.9) | 0.53 (0.32 to 0.89)* |
| Respiratory system | 23 (6.8) | 510 (9.0) | 0.70 (0.49 to 0.98)* |