Fig. 2.

Percentage change with 95% confidence interval of hospital admissions for total and cause-special cardiovascular disease associated with a 1 mg/m³ increase in daily CO concentrations with varying lag patterns. Data are percentage changes (%) with 95% confidence intervals. Lag ₀ = current day. Lag ₁ = previous 1 day. Lag ₂ = previous 2 days. Lag ₃ = previous 3 days. Lag ₄ = previous 4 days. Lag ₅ = previous 5 days. Lag _0–1 = 2-days moving average of lag ₀ - lag ₁. Lag _0–3 = 4-days moving average of lag ₀ - lag ₄. Lag _0–5 = 6-days moving average of lag ₀ - lag ₅