X_i

Y = 1 = case

Y = 0 = non case

∑_j

X = 1 = exposed

a₂ = 145

b₂ = 642

n₁₂ = 787

X = 0 = non exposed

c₂ = 26

d₂ = 196

n₀₂ = 220

∑_i

m₁₂ = 171

m₀₂ = 836

T₂ = 1007