X_i

Y = 1 = case

Y = 0 = non case

∑_j

X = 1 = exposed

a₁ = 80

b₁ = 381

n₁₁ = 461

X = 0 = non exposed

c₁ = 13

d₁ = 121

n₀₁ = 134

∑_i

m₁₁ = 93

m₀₁ = 502

T₁ = 595