highly significantp = 0.062
all closed, 4 differed highly significant whereas the comparison of interval 4 (all open with 27.2 μg/m 3 ± 7.2 μg/m 3 ) vs. 5 (all closed with 23.7 μg/m 3 ± 3.6 μg/m 3 ) did not differ significantly (p = 0.062).
all closed, 4 differed highly significant whereas the comparison of interval 4 (all open with 27.2 μg/m 3 ± 7.2 μg/m 3 ) vs. 5 (all closed with 23.7 μg/m 3 ± 3.6 μg/m 3 ) did not differ significantly (p = 0.062).