Table 2: Prevalence, overall percent agreement, positive percent agreement, and Kappa statistic for agreement of variables between CIHI-DAD and BIS data sources in full linked dataset.
| Condition (N = 779,979) | Prevalence, % | Difference DAD-BIS | Overall % Agreement | Positive % Agreement | Kappa coefficient (95% CI) | ||
| DAD | BIS | DAD cases in BIS | BIS cases in DAD | ||||
| Exclusions for the QBP Low Risk Birth definition | |||||||
| Age <10 or >35 years | 17.74% | 17.79% | ‒0.05% | 99.9% | 99.7% | 99.9% | 0.998 (0.997–0.998) |
| Multifetal birth | 1.86% | 1.78% | 0.08% | 99.9% | 99.3% | 95.2% | 0.971 (0.969–0.973) |
| Parous | 56.45% | 57.29% | ‒1.00% | 97.7% | 97.3% | 98.7% | 0.953 (0.953–0.954) |
| Preterm birth <37 weeks’ gestation | 7.44% | 7.49% | ‒0.05% | 99.4% | 95.3% | 96.0% | 0.953 (0.952–0.954) |
| Not a livebirth | 0.50% | 0.47% | 0.03% | 99.9% | 94.8% | 89.1% | 0.919 (0.912–0.925) |
| Diabetes (pre-existing or gestational) | 7.99% | 7.50% | 0.49% | 98.0% | 88.4% | 82.9% | 0.844 (0.841–0.846) |
| Cesarean section without labour | 14.39% | 15.05% | ‒0.66% | 96.0% | 84.6% | 88.5% | 0.842 (0.840–0.843) |
| Hypertensive disorder | 5.67% | 4.86% | 0.81% | 97.1% | 78.1% | 66.9% | 0.706 (0.702–0.709) |
| Non-spontaneous labour | 26.31% | 40.36% | ‒14.26% | 77.7% | 55.0% | 84.3% | 0.509 (0.507–0.511) |
| Placental disorder | 2.30% | 1.57% | 0.73% | 97.9% | 55.6% | 38.0% | 0.441 (0.434–0.448) |
| Fetal complication | 7.75% | 5.72% | 2.03% | 93.0% | 56.8% | 41.9% | 0.446 (0.442–0.450) |
| Non-cephalic presentation | 9.60% | 11.06% | ‒1.46% | 89.0% | 43.87% | 50.55% | 0.409 (0.406–0.412) |
| Autoimmune condition | 0.13% | 0.48% | ‒0.35% | 99.5% | 14.8% | 53.5% | 0.231 (0.215–0.246) |
| Haemotologic disorder | 1.17% | 1.75% | ‒0.58% | 97.8% | 20.6% | 30.8% | 0.236 (0.229–0.244) |
| Cancer | 0.14% | 0.23% | ‒0.09% | 99.7% | 20.5% | 34.1% | 0.255 (0.234–0.276) |
| Obesity (BMI ≥ 40 kg/m2) | 1.70% | 2.88% | ‒1.18% | 97.0% | 21.7% | 36.6% | 0.256 (0.250–0.262) |
| Gastrointestinal condition | 0.80% | 0.83% | ‒0.03% | 98.7% | 20.1% | 20.8% | 0.198 (0.188–0.207) |
| Cardiovascular disease | 1.16% | 2.08% | ‒0.92% | 97.1% | 9.0% | 16.1% | 0.102 (0.096–0.107) |
| Neurologic condition | 0.16% | 1.50% | ‒1.34% | 98.5% | 3.9% | 37.6% | 0.068 (0.062–0.075) |
| Genitourinary condition | 4.54% | 1.37% | 3.17% | 94.4% | 11.9% | 3.6% | 0.035 (0.032–0.038) |
| Musculoskeletal condition | 0.02% | 0.5% | ‒0.48% | 99.5% | 0.85% | 28.21% | 0.016 (0.011–0.022) |
| Pulmonary condition | 0.10% | 4.02% | ‒3.92% | 95.9% | 0.6% | 25.6% | 0.010 (0.009–0.012) |
| Any exclusion | 82.50% | 83.30% | ‒0.80% | 92.0% | 94.7% | 95.6% | 0.717 (0.715–0.719) |
| Small-for-gestational age <10th percentile | 9.38% | 9.48% | ‒0.11% | 98.8% | 93.3% | 94.4% | 0.932(0.931–0.933) |
| Large-for-gestational age >90th percentile | 10.06% | 10.05% | 0.01% | 98.9% | 94.5% | 94.4% | 0.938 (0.937–0.940) |
| Extreme preterm birth <32 weeks’ gestation | 1.25% | 1.26% | ‒0.01% | 99.9% | 96.7% | 97.5% | 0.970 (0.968–0.973) |
| Pre-existing diabetes (ODD vs BIS) | 0.76% | 1.00% | ‒0.24% | 98.7% | 20.68% | 27.3% | 0.229 (0.219–0.238) |
| Pre-existing hypertension (HYPER vs BIS) | 0.66% | 0.95% | ‒0.29% | 98.7% | 16.3% | 23.4% | 0.186 (0.177–0.195) |
Legend: Based on Landis and Koch’s classification of Cohen’s kappa.13
- Almost perfect
- Substantial
- Moderate
- Fair
- Slight