Relative risk (and 95% confidence interval) Birth weight (grams) <500 500–749 750–999 1,000–1,249 1,250–1,499 1,500–1,999 2,000–2,499 2,500–3,999 4,000–6,999 Not available TOTALd TOTALe
Buehler JW, Kleinman JC, Hodgue CJ, Strauss LT, Smith JC. Birth weight-specific infant mortality, United States, 1960 to 1990.