1979–1980 | 1985–1987 | 1991–1992 | 1997 | 2005 | Mean difference (95% CI)* | p value | |
---|---|---|---|---|---|---|---|
500–999 g | |||||||
Live births (n) | 348 | 560 | 423 | 226 | 257 | −3.6 (−11.2 to 4.0) | 0.35 |
Total utilities | 68.1 | 178.3 | 202.7 | 137.1 | 146.7 | ||
Quality-adjusted survival (%) | 19.4 | 31.8 | 47.3 | 60.7 | 57.1 | ||
500–749 g | |||||||
Live births (n) | 128 | 223 | 164 | 105 | 131 | −10.4 (−21.4 to 0.6) | 0.063 |
Total utilities | 5.0 | 18.1 | 43.1 | 49.1 | 47.6 | ||
Quality-adjusted survival (%) | 3.9 | 8.1 | 26.3 | 46.7 | 36.3 | ||
750–999 g | |||||||
Live births (n) | 220 | 337 | 259 | 121 | 126 | 5.9 (−2.6 to 14.4) | 0.17 |
Total utilities | 63.1 | 160.2 | 159.6 | 88.0 | 99.1 | ||
Quality-adjusted survival (%) | 28.7 | 47.5 | 61.6 | 72.8 | 78.7 |
↵* For comparison of quality-adjusted survival rates between 2005 and 1997; quality-adjusted survival rate comparisons between previous eras reported earlier.1