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Table 1 Daily emergency hospital visits, pollutant levels and meteorological variables in Reykjavík 2003-2009

From: Ozone is associated with cardiopulmonary and stroke emergency hospital visits in Reykjavík, Iceland 2003–2009

  n (%) Mean Std. dev Min-imum Max-imum Percentiles
       25th 50th 75th
Emergency hospital visits
All 24439 (100%) 9.6 3.8 0 26 7 9 12
Cardiaca 18782 (76.9%) 7.3 3.3 0 20 5 7 9
Strokeb 4082 (16.7%) 1.6 1.3 0 8 1 1 2
Pulmonaryc 1575 (6.4%) 0.6 0.8 0 5 0 0 1
Female 10269 (42.0%) 4.0 2.2 0 14 2 4 5
Male 14170 (58.0%) 5.5 2.6 0 16 4 5 7
Age 70 years or older 14862 (60.8%) 5.8 2.7 0 19 4 6 7
Pollutants & meteorological variables
O3 (μg/m3)d 2355 (92.1%) 47.3 16.8 1.4 119.4 36.3 46.1 57.2
NO2 (μg/m3) 2372 (92.8%) 22.1 13.6 1.5 111.6 12.0 19.2 28.6
PM10 (μg/m3) 2396 (93.7%) 21.2 19.8 1.3 261.1 11.0 15.6 23.6
Temperature (°C) 2533 (99.1%) 6.0 5.2 −11.3 21.2 2.3 6.2 10.4
Relative humidity (%) 2533 (99.1%) 78.0 10.8 39.3 100.0 70.5 79.6 86.3
  1. Daily counts for emergency hospital visits were available for all days. n denotes the total number of emergency hospital visits. For pollutants and meteorological variables, n denotes the number of days with data available. The total number of days in the period is 2557.
  2. Std. dev; Standard deviation.
  3. a Cardiac disease (ICD10 codes starting with I20-I27, I46, I48 and I50).
  4. b Stroke (Cerebrovascular disease) (ICD10 codes starting with I61-I69 and G45-G46).
  5. c Pulmonary diseases (ICD10 codes starting with J20-J22, J40-J46 and J96).
  6. d Maximum daily 8-hour mean, daily 24-hour mean for other exposure variables.