Table 2.
Comparison of Cox proportional HR in relation to the risk of death
| n | HR | 95% CI | P | |
|---|---|---|---|---|
| Age | ||||
| Up to 50 years old | 27 932 | 1.00 | ||
| 51–67 years old | 25 747 | 1.74 | 1.67–1.82 | <0.001 |
| 68 years old or more | 26 444 | 2.77 | 2.66–2.88 | <0.001 |
| Sex | ||||
| Male | 45 926 | 1.01 | 0.98–1.03 | 0.668 |
| Female | 34 176 | 1.00 | ||
| Race | ||||
| White or Yellow | 24 091 | 1.00 | ||
| Black or mixed | 26 614 | 1.54 | 1.49–1.59 | <0.001 |
| Level of education | ||||
| Higher education | 5223 | 1.00 | ||
| Intermediate/elementary education | 8954 | 1.49 | 1.36–1.62 | <0.001 |
| Low education | 10 391 | 2.23 | 2.06–2.42 | <0.001 |
| Illiterate | 1630 | 3.29 | 2.95–3.66 | <0.001 |
| Zone | ||||
| Urban | 68 418 | 1.00 | ||
| Rural | 1864 | 1.26 | 1.16–1.38 | <0.001 |
| Influenza-like outbreak | ||||
| Yes | 19 609 | 1.18 | 1.14–1.22 | <0.001 |
| No | 35 911 | 1.00 | ||
| Hospital-acquired infection | ||||
| Yes | 2143 | 1.07 | 1.00–1.15 | 0.044 |
| No | 52 180 | 1.00 | ||
| Fever | ||||
| Yes | 58 977 | 0.79 | 0.77–0.83 | <0.001 |
| No | 13 132 | 1.00 | ||
| Cough | ||||
| Yes | 61 368 | 0.79 | 0.76–0.82 | <0.001 |
| No | 10 817 | 1.00 | ||
| Throat | ||||
| Yes | 17 084 | 0.88 | 0.85–0.91 | <0.001 |
| No | 40 740 | 1.00 | ||
| Dyspnoea (shortness of breath) | ||||
| Yes | 55 650 | 1.46 | 1.40–1.53 | <0.001 |
| No | 15 218 | 1.00 | ||
| Respiratory distress | ||||
| Yes | 46 460 | 1.48 | 1.43–1.54 | <0.001 |
| No | 19 326 | 1.00 | ||
| O2 <95% saturation | ||||
| Yes | 44 351 | 1.74 | 1.67–1.81 | <0.001 |
| No | 21 198 | 1.00 | ||
| Diarrhoea | ||||
| Yes | 10 881 | 0.86 | 0.82–0.90 | <0.001 |
| No | 45 191 | 1.00 | ||
| Vomit | ||||
| Yes | 6128 | 0.93 | 0.88–0.98 | 0.007 |
| No | 48 436 | 1.00 | ||
| Cardiopathy | ||||
| Yes | 25 160 | 1.18 | 1.13–1.22 | <0.001 |
| No | 12 619 | 1.00 | ||
| Haematological | ||||
| Yes | 759 | 1.03 | 0.91–1.16 | 0.629 |
| No | 25 487 | 1.00 | ||
| Down's syndrome | ||||
| Yes | 200 | 1.51 | 1.20–1.90 | <0.001 |
| No | 25 911 | 1.00 | ||
| Hepatic | ||||
| Yes | 680 | 1.13 | 1.01–1.26 | 0.042 |
| No | 25 372 | 1.00 | ||
| Asthma | ||||
| Yes | 2238 | 0.66 | 0.61–0.73 | <0.001 |
| No | 24 492 | 1.00 | ||
| Diabetes | ||||
| Yes | 18 872 | 1.19 | 1.14–1.23 | <0.001 |
| No | 15 655 | 1.00 | ||
| Neurological | ||||
| Yes | 3007 | 1.31 | 1.24–1.39 | <0.001 |
| No | 24 212 | 1.00 | ||
| Pneumopathy | ||||
| Yes | 2935 | 1.11 | 1.05–1.18 | <0.001 |
| No | 24 148 | 1.00 | ||
| Immunodepression | ||||
| Yes | 2405 | 0.93 | 0.87–1.00 | 0.063 |
| No | 24 237 | 1.00 | ||
| Kidney disease | ||||
| Yes | 3258 | 1.25 | 1.19–1.32 | <0.001 |
| No | 23 729 | 1.00 | ||
| BMI | ||||
| Normal | 17 | 1.00 | ||
| Overweight | 139 | 1.18 | 0.53–2.61 | 0.675 |
| Obesity I | 1227 | 1.00 | 0.47–2.12 | 0.990 |
| Obesity II | 616 | 1.16 | 0.54–2.45 | 0.706 |
| Obesity III | 475 | 1.27 | 0.59–2.70 | 0.539 |
| Vaccine | ||||
| Yes | 9914 | 1.01 | 0.97–1.07 | 0.532 |
| No | 21 723 | 1.00 | ||
| Anti-viral | ||||
| Yes | 26 461 | 0.97 | 0.94–1.00 | 0.076 |
| No | 34 881 | 1.00 | ||
| Antiviral type | ||||
| Oseltamivir | 23 906 | 1.00 | ||
| Zanamivir | 114 | 1.13 | 0.81–1.57 | 0.473 |
| Other | 910 | 0.95 | 0.82–1.10 | 0.491 |
| ICU | ||||
| Yes | 24 284 | 1.38 | 1.34–1.43 | <0.001 |
| No | 40 834 | 1.00 | ||
| Ventilatory support | ||||
| Yes, invasive | 23 638 | 2.94 | 2.81–3.07 | <0.001 |
| Yes, not invasive | 27 900 | 1.59 | 1.52–1.66 | <0.001 |
| No | 14 806 | 1.00 | ||
| X-ray | ||||
| Normal | 2173 | 1.00 | ||
| Infiltrate interstitial | 16 003 | 1.42 | 1.28–1.57 | <0.001 |
| Consolidated | 2277 | 1.42 | 1.26–1.61 | <0.001 |
| Mixed | 2723 | 1.42 | 1.26–1.59 | <0.001 |
| ICU length of stay | ||||
| Up to 8 days | 9452 | 9.15 | 8.73–9.60 | <0.001 |
| >8 days | 7588 | 1.00 | ||