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Table 4 Comparison of the median kitchen risk score and sleeping-area risk score among subjects with asthma-like symptoms and asthma and those without such symptoms in winter and summer

From: Correlation between indoor air pollution and adult respiratory health in Zunyi City in Southwest China: situation in two different seasons

Asthma-like symptoms and asthma Winter (n = 1207) Summer (n = 610)
Median score for kitchen risk factor (25th, 75th percentiles) Median score for sleeping- area risk factor (25th, 75th percentiles) Median score for kitchen risk factors (25th,75th percentiles) Median score for sleeping area risk factors (25th,75th percentiles)
Subjects with asthma-like symptoms and asthma 6.0 (5.0–8.0) 3.0 (1.0–5.0) 3.5 (2.0–7.0) 2.0 (0.75–4.25)
Subjects without asthma-like symptoms and asthma (n = 1049) 6.0 (4.0–7.0) 2.0 (1.0–4.0) 2.0 (1.0–5.0) 2.0 (1.0–3.0)
Z value −4.481a −4.007a −3.06a −1.46a
p value < 0.001*** < 0.001*** 0.002** 0.144
  1. aNonparametric test (Mann–Whitney U test), α = 0.05; *significant at p < 0.05, **significant at p < 0.01, *** significant at p < 0.001