Period | Operating segment | ||
---|---|---|---|
All segments combined Observed/expected SMR (95% CI) | Refinery or petrochemical Observed/expected SMR (95% CI) | ||
1964–83 | 7/1.90 | 6/0.80 | |
3.68 (1.48 to 7.59)3-150 | 7.50 (2.75 to 16.32)3-150 | ||
1984–94 | 17/4.94 | 17/1.86 | |
3.44 (2.00 to 5.51)3-150 | 9.14 (5.32 to 14.63)3-150 | ||
Total period (1964–94) | 24/6.83 | 23/2.65 | |
3.51 (2.25 to 5.22)3-150 | 8.68 (5.51 to 13.03)3-150 |