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Table 2 Ratio of mean winter solar insolation/mean summer solar insolation and ratio of minimum mean monthly insolation/maximum mean monthly insolation by latitude for patient onset locations (N = 4876)

From: Variations in seasonal solar insolation are associated with a history of suicide attempts in bipolar I disorder

Degrees latitude north + south

N

%

Ratio mean winter insolation/mean summer insolation

Ratio minimum mean monthly insolation/maximum mean monthly insolation

0–9

268

5.5

1.0313

0.8076

10–19

420

8.6

1.1074

0.6744

20–29

254

5.2

0.7772

0.6093

30–39

1333

27.3

0.4075

0.3165

40–49

1921

39.4

0.3023

0.2119

50–59

444

9.1

0.1662

0.0903

60 + 

236

4.8

0.0857

0.0220

Total

4876

100.0

0.4423

0.3135