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Table 1 Descriptive statistics for the daily counts of psychiatric emergency visits (PEVs) and air pollutant concentrations (μg/m3)

From: The association between daily concentrations of air pollution and visits to a psychiatric emergency unit: a case-crossover study

  Mean SDa Min Max Median Q1b Q3c Missing days
PEV 27 6 8 50 27 22 31 0 (0%)
PM10 14.2 6.6 1.8 65.6 12.9 10.0 16.7 153 (9.5%)
NO2 19.5 11.0 2.9 98.4 17.1 11.8 24.6 32 (2.0%)
O3 50.3 20.0 2.8 155.0 50.2 36.5 63.8 112 (7.0%)
Warmer months (April to September)
 PEV 27 6 11 50 27 22 31 0 (0%)
 PM10 13.5 5.4 2.0 60.5 12.5 10.1 15.8 7 (0.8%)
 NO2 17.2 8.7 2.9 56.1 15.4 11.0 21.3 5 (0.6%)
 O3 57.9 18.1 10.6 155.0 57.4 45. 69.7 15 (1.8%)
Colder months (October to March)
 PEV 27 6 8 46 26 22 31 0 (0%)
 PM10 15.1 7.8 1.8 65.6 13.7 9.8 18.5 146 (18.6%)
 NO2 22.0 12.6 2.9 98.4 19.4 13.0 27.9 27 (3.4%)
 O3 41.3 18.2 2.8 91.3 40.7 27.3 54.1 97 (12.4%)
  1. aSD Standard deviation, bQ1 1st quartile, cQ3 3rd quartile