Reference | Date of cohort | Location of cohort | Type of cohort | Sample size | Gestational age | Birth weight | Type of costs |
---|---|---|---|---|---|---|---|
Adams et al25 | 1996 | USA | Convenience sample | Total: 12 125 Normal PT: 456 Extreme PT: 513 Term: 9179 | Not specified | Not specified | Hospital; professional |
Brazier et al26 | Not specified | UK | Hospital specific | Total: 38 | Not specified | Not specified | Travel |
Chollet et al27 | 1989–1991 | USA | Convenience sample | Total: 58 904 Normal PT: 946 Extreme PT: 986 Term: 44 041 | All | All | Hospital; professional |
Dorling et al28 | 1993–1997 | UK (East Anglia) | Geographic (region) | Total: 1244 | Not specified | <1500 g | Hospital |
Doyle29 | 1997 | Australia (Victoria) | Geographic (state) | Total: 233 | Not specified | 500–999 g | Hospital |
Giacoia et al30 | 1983–1984 | USA | Hospital specific | Total: 167 | Not specified | All | Travel |
Gilbert et al31 | 1996 | USA (California) | Geographic (state) | 25–38 weeks: 147 224 500–3000 g: 458 366 | 25–38 weeks | 500–3000 g | Hospital |
Kilpatrick et al.10 | 1990–1994 | USA (California) | Hospital specific | Total: 138 | 24–26 weeks | Not specified | Hospital |
Luke et al32 | 1991–1992 | USA (Illinois) | Hospital specific | Singletons: 106 Twins: 111 | All | All | Hospital |
Marbella et al33 | 1989–1994 | USA (Wisconsin) | Geographic (state) | PT: 26 668 Term: 368 955 | Not specified | All | Hospital |
McLoughlin et al34 | Not specified | UK | Hospital specific | Total: 109 | 22–37 weeks | <2500 g | Travel |
Phibbs and Schmittet35 | 1998–2000 | USA (California) | Geographic (state) | Total: 193 167 | All | All | Hospital |
Ringborg et al36 | 1998–2001 | Sweden | National | Total: 24 583 | All | All | Hospital |
Rogowski37 | 1993–1994 | USA | 25 self selected hospitals | Total: 3288 | Not specified | 501–1500 g | Hospital |
Rogowski38 | 1997–1998 | USA | 29 hospitals in neonatal network | Total: 6797 | Not specified | 501–1500 g | Hospital |
Schmitt et al39 | 2000 | USA (California) | Geographic (state) | Total: 518 697 | All | All | Hospital |
St John et al40 | 1989–1992 | USA (Alabama) | Hospital specific | Total: 958 | 24–32 vs 33–42 weeks | Not specified | Hospital; professional |
Tommiska et al41 | 1996–1997 | Finland | Geographic (regional hospital) | <1000 g: 105 Controls: 75 | ≥22 weeks | <1000 g | Hospital; non-medical direct; productivity losses |
VICSG42 | 1991–1992 | Australia (Victoria) | Geographic (state) | Total: 429 | Not specified | 500–999 g | Hospital |
PT, preterm; VICSG, The Victorian Infant Collaborative Study Group.