Table 3.

Correlations of Schizophrenia Prevalence with Predictor Variables

Geographic Group of Samples	N	Absolute Latitudea	Temperatureb	Infant Mortalityc	Fish Intaked
All study samples	49	.46**	−.60***	−.26†	−.10
Europe	18	.58*	−.81***	−.22	−.21
North America
All samples	10	.75*	−.74*	.92***	−.64†
High infant mortality	3	.94	−.99*	.97	n/a
Low infant mortality	7	.68†	−.62	.58	−.85*
Asia
All samples	15	.58*	−.56*	.05	−.05
South Asia	9	.51†	−.51†	.49	−.49
East Asia	6	.78*	−.69	.46	−.20
Africa	4	.53	−.67	.25	−.81
Othere	2	n/a	n/a	n/a	n/a

n/a = data available on only 2 samples.

^aAbsolute latitude in degrees north or south of the equator.

^bMean low temperature for the coldest month of the year in degrees Fahrenheit.

^cInfant mortality rate is the number of cases per 1000 adult population.

^dFish intake (in kg/person/year); n = 48 because data were not available for Oxford Bay.⁶⁸

^eIncludes Christchurch, New Zealand, and Buenos Aires, Argentina.

^†0.05 < P ≤ .10; *P < 0.05; **P < 0.001; ***P < 0.0005; all P values are two tailed, for Pearson product-moment correlations.