Sociodemographic and clinical characteristics of the first 100 confirmed deaths due to influenza A(H1N1) compared with sociodemographic and clinical characteristics of the total population, Mexico 2009
| Cases of influenza A(H1N1) | National* | ||
| N | % (95% CI) | % (95% CI) | |
| Age range† | |||
| 0–9 | 10 | 10.0 | 19.2 |
| 10–29 | 30 | 30.0 | 37.8 |
| 30–79 | 60 | 60.0 | 43.1 |
| Gender† | |||
| Male‡ | 47 | 47 | 49.2 |
| Area of residence† | |||
| Mexico City | 40 | 40 | 8.2 |
| State of Mexico | 21 | 21 | 13.8 |
| Other states | 39 | 39 | 78 |
| Clinical background§ | |||
| Pre-existing chronic disease | |||
| Metabolic syndrome¶ | 34 | 39.5 (29.0 to 50.1) | 14.5 (13.9 to 15.1) |
| Cardiovascular diseases** | 18 | 20.9 (12.2 to 29.7) | 4.1 (3.8 to 4.4) |
| Hypertension†† | 17 | 19.8 (11.2 to 28.4) | 15.4 (14.8 to 16.0) |
| Diabetes†† | 17 | 19.8 (11.2 to 28.4) | 7 (6.6 to 7.5) |
| Respiratory‡‡ | 7 | 8.1 (2.2 to 14.0) | 0.4 (0.37 to 0.46) |
| Infectious§§ | 3 | 3.5 (0.4 to 7.4) | 3.1 (2.9 to 3.4) |
| Autoimmune diseases¶¶ | 2 | 2.3 (0 to 5.6) | – |
| Cancer | 1 | 1.2 (1.1 to 3.5) | 0.8 (0.7 to 0.9) |
| Tobacco use | |||
| Non-smoker | 35 | 40.7 | 70.3 |
| Current or former smoker | 29 | 33.7 | 29.7 |
| Not specified | 22 | 25.6 | 0 |
| BMI men*** | |||
| Underweight | 2 | 5.1 (0.0 to 12.4) | 1.5 (1.2 to 1.9) |
| Normal | 19 | 48.7 (22.3 to 65.1) | 31.7 (30.2 to 33.2) |
| Overweight | 8 | 20.5 (7.3 to 33.8) | 42.5 (41.1 to 44.0) |
| Obesity | 10 | 25.7 (11.3 to 40.0) | 24.2 (23.0 to 25.6) |
| BMI women*** | |||
| Underweight | 1 | 2.1 (0.0 to 6.4) | 1.4 (1.1 to 1.8) |
| Normal | 19 | 40.4 (25.9 to 55.0) | 26.7 (25.6 to 27.8) |
| Overweight | 9 | 19.1 (7.5 to 30.8) | 37.4 (36.1 to 38.7) |
| Obesity | 18 | 38.3 (23.9 to 52.7) | 34.5 (33.4 to 35.7) |
↵* Only the population at the beginning of the year 2009 aged <80 years was considered (N=105 878 876).
↵† Estimates from Consejo Nacional de Población (National Population Council).21
↵‡ Three women were pregnant with 24, 34 and 38 weeks gestation.
↵§ Cases under 20 years were excluded because National Health Survey 2006 only calculates chronic disease in persons aged ≥20 years.
↵¶ For H1N1 deaths that had a prior diagnosis of metabolic syndrome, we included obesity, diabetes mellitus or hypothyroidism. For ENSANUT, metabolic syndrome also includes prior diagnosis of obesity and diabetes using data from ENSANUT adult questionnaire.
↵** Using ENSANUT adult questionnaire data, we calculated prior diagnosis of cardiovascular disease (infarct, cardiac insufficiency and other heart conditions).
↵†† Using ENSANUT adult questionnaire data, we calculated prior diagnosis of diabetes.
↵‡‡ Asthma and tuberculosis were calculated from ENSANUT list of chronic diseases.
↵§§ Using ENSANUT, we calculated the occurrence of respiratory, urinary and sexually transmitted infections 2 weeks prior to the 2006 national survey.
↵¶¶ The ENSANUT sample size was insufficient to carry out an estimate.
↵*** Underweight (BMI <18.5 kg/m2), normal (BMI 18.5–24.9 kg/m2), overweight (BMI 25.0–29.9 kg/m2), obese (BMI ≥30.0 kg/m2).