I've attached 2 short-term outcomes papers, and a previous paper from the Neonatal Research Network about predicting outcomes. This one resulted in an "outcomes predictor" - link at http://www.nichd.nih.gov/about/org/der/branches/ppb/programs/epbo/Pages/epbo_case.aspx?start=21:55:37.
It's very difficult to get a good handle on long term outcomes for large populations of extremely preterm infants - there aren't that many at 22 - 23 weeks, they have a high mortality rate, and follow up studies are limited. There is a wide variability in reported outcomes by center and by country, also.
One statement in the discussion section of the Stoll paper: "During the 5-year study period, there was no substantial improvement in rates of survival to discharge for extremely low gestation infants born at NRN centers"
Kristi Watterberg, M.D.
Professor, Division of Neonatology
Dept. of Pediatrics
Albuquerque, New Mexico