Odds ratio (95% CI) for case fatality rates Risk factor No of admissions Within 30 days Within 90 days Within 365 days Time period Men: 1968-73 338 1.00 1.00 1.00 1974-78 741 0.88 (0.63 to 1.22) 0.82 (0.61 to 1.09) 0.77 (0.59 to 1.01) 1979-83 976 0.75 (0.54 to 1.04) 0.72 (0.54 to 0.95) 0.80 (0.62 to 1.04) 1984-88 994 0.62 (0.44 to 0.86) 0.63 (0.47 to 0.83) 0.68 (0.52 to 0.88) 1989-93 1 295 0.59 (0.43 to 0.81) 0.59 (0.45 to 0.78) 0.68 (0.53 to 0.88) 1994-98 1 556 0.64 (0.47 to 0.87) 0.60 (0.46 to 0.78) 0.60 (0.47 to 0.77) Women: 1968-73 1 593 1.00 1.00 1.00 1974-78 3 557 0.74 (0.63 to 0.87) 0.72 (0.63 to 0.82) 0.84 (0.74 to 0.96) 1979-83 4 678 0.61 (0.52 to 0.72) 0.60 (0.52 to 0.68) 0.73 (0.64 to 0.82) 1984-88 4 731 0.44 (0.37 to 0.52) 0.44 (0.38 to 0.51) 0.56 (0.49 to 0.63) 1989-93 5 875 0.39 (0.33 to 0.46) 0.39 (0.34 to 0.45) 0.52 (0.46 to 0.59) 1994-98 6 253 0.46 (0.39 to 0.54) 0.43 (0.37 to 0.49) 0.55 (0.49 to 0.62) Marital status Men: Single 343 1.00 1.00 1.00 Married 2 196 1.01 (0.71 to 1.43) 1.08 (0.80 to 1.45) 1.09 (0.85 to 1.40) Widowed 1 376 0.97 (0.67 to 1.40) 1.18 (0.87 to 1.59) 1.19 (0.91 to 1.54) Divorced or separated 66 1.13 (0.50 to 2.56) 0.93 (0.46 to 1.92) 0.77 (0.42 to 1.43) Women: Single 2 383 1.00 1.00 1.00 Married 4 440 0.84 (0.70 to 1.01) 0.78 (0.68 to 0.90) 0.83 (0.74 to 0.94) Widowed 11 678 1.00 (0.87 to 1.16) 0.98 (0.87 to 1.09) 1.00 (0.91 to 1.11) Divorced or separated 177 0.70 (0.38 to 1.32) 0.83 (0.53 to 1.29) 0.77 (0.53 to 1.12) Social class I and II 803 1.00 1.00 1.00 III 591 1.34 (0.98 to 1.83) 1.47 (1.14 to 1.90) 1.31 (1.03 to 1.65) IV and V 418 2.47 (1.79 to 3.42) 2.04 (1.54 to 2.70) 1.75 (1.34 to 2.27)

Analyses for social class are for 1968-88 only.