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. 2020 Mar 25;15(3):e0230316. doi: 10.1371/journal.pone.0230316

Table 6. Effect of temperature over previous 30 days on the probability of self-reported mental health difficulties: By climate region.

(1) (2) (3) (4) (5) (6) (7) (8)
Hot Mild Hot Mild Cold Cold Hot Mild Hot Mild Cold Cold
lat≤35° 35°<lat≤40° 40°<lat≤43° lat>43° Temp<47.6°F 47.6°F< Temp≤54.9°F 54.9°F< Temp≤62.4°F Temp≥62.4°F
<20°F -0.0103 -0.0108** -0.0030 -0.0016 0.2246** 0.0136 -0.0064 -0.0019
(0.0303) (0.0046) (0.0054) (0.0051) (0.1129) (0.0086) (0.0043) (0.0012)
20–30°F -0.0039 -0.0040 0.0061 0.0020 0.0038 -0.0014 0.0037 -0.0015
(0.0086) (0.0039) (0.0047) (0.0045) (0.0139) (0.0061) (0.0035) (0.0010)
30–40°F -0.0073* -0.0080** 0.0019 -0.0025 -0.0095 -0.0044 -0.0019 -0.0014
(0.0044) (0.0036) (0.0038) (0.0035) (0.0059) (0.0049) (0.0031) (0.0009)
40–50°F -0.0031 -0.0026 -0.0022 -0.0009 -0.0027 -0.0015 -0.0005 -0.0015**
(0.0022) (0.0026) (0.0031) (0.0027) (0.0023) (0.0032) (0.0025) (0.0006)
50–60°F -0.0009 -0.0041* 0.0018 -0.0011 -0.0015 -0.0030 0.0002 -0.0007
(0.0015) (0.0024) (0.0027) (0.0024) (0.0020) (0.0024) (0.0022) (0.0005)
70–80°F 0.0036* 0.0001 0.0027 0.0033 0.0047*** -0.0000 0.0032* 0.0003
(0.0019) (0.0016) (0.0021) (0.0025) (0.0016) (0.0022) (0.0018) (0.0005)
≥80°F 0.0047** 0.0043** -0.0045 0.0071 0.0057*** 0.0013 0.0035 0.0005
(0.0023) (0.0021) (0.0036) (0.0068) (0.0019) (0.0027) (0.0035) (0.0023)
N 620,294 861,239 894,323 680,083 497,339 698,296 1,228,185 632,168
No. of Counties 638 870 468 424 474 719 728 479
# days/yr average temperature>70°F 161 97 61 34 173 114 67 33

Regressions follow Column (5) in Table 2; The climate regions are divided based on latitude of the centroid location of the county for columns (1) to (4), and by the average daily temperature over the study period for columns (5) to (8); The number of days above 70°F each year is also displayed.

*** p<0.01,

** p<0.05,

* p<0.1.