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International Journal of Bipolar Disorders

Table 4 Estimated parameters for best model explaining a history of suicide attempts for patients with bipolar I disorder (N = 4876)

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

Parameters

   

99% Confidence interval

Coefficient significance

 

Coefficient estimate (β)

Standard error

Exp (β)

Lower

Upper

Wald Chi-squared

P

Intercept

− 0.935

0.2279

0.393

− 1.522

− 0.348

16.815

 < 0.001

Ratio mean winter insolation/mean summer insolation

− 0.730

0.1752

0.482

− 1.181

− 0.279

17.357

 < 0.001

State sponsored religion in onset country

− 0.438

0.1145

0.645

− 0.733

− 0.143

14.655

 < 0.001

Male

− 0.609

0.0792

0.544

− 0.813

− 0.405

59.096

 < 0.001

History of alcohol or substance abuse

0.459

0.0726

1.582

0.272

0.646

39.978

 < 0.001

DOB ≥ 1960

0.822

0.2289

2.275

0.232

1.414

12.890

 < 0.001a

DOB ≥ 1940 and DOB < 1960

0.681

0.2064

1.975

0.149

1.212

10.872

0.001a

  1. Dependent variable: history of suicide attempts (yes/no). Model: intercept, ratio of mean winter insolation/mean summer insolation at onset location, gender, state sponsored religion in onset country (yes/no), alcohol or substance abuse (yes/no) and birth cohort group (DOB < 1940, DOB ≥ 1940 and DOB < 1960, DOB ≥ 1960)
  2. aIndividual parameters Wald Chi-square statistics and significance. The model effects Wald Chi-square and significance for the cohort parameter was 12.904 and 0.002, respectively with 2 degrees of freedom
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