| Period | MH N (%) | Mortality N (%) | Median age (IQ) | Succinylcholine (%) | Dantrolene (%) |
|---|---|---|---|---|---|
| 1969–2007 | 115 | 35 (31) | 16 (7–21) | 50 | 46 |
| 1969–1979 | 22 (19) | 13 (59) | 14 (11–20) | 76 | 0 |
| 1980–1989 | 37 (32) | 14 (38) | 13 (6–22) | 64 | 42 |
| 1990–1999 | 41 (35) | 7 (18) | 15 (10–28) | 39 | 68 |
| 2000–2007 | 15 (13) | 1 (7) | 20 (13–28) | 8 | 60 |
| p<0.002 | NS | p<0.007 | p<0.001 |