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Table 1 Gestational age-specific rates of cerebral palsy based on live births within a gestational age category and based on the number of fetuses at risk for cerebral palsy, Shiga Prefecture, Japan [6], 1977 to 1991.

From: Does the risk of cerebral palsy increase or decrease with increasing gestational age?

Gestational age (weeks) Live births Cases of cerebral palsy Rate of cerebral palsy† Fetuses at risk for cerebral palsy Rate of cerebral palsy‡
<28 266 17 63.9 226,052 0.08
28–31 780 55 70.5 225,786 0.24
32–36 7,331 52 7.1 225,006 0.23
≥37 217,675 201 0.9 217,675 0.92
Total 226,052 325 1.4 226,052 1.44
  1. † rate per 1,000 live births, calculated using the number of live births within the gestational age category as the denominator. ‡ rate per 1,000 fetuses at risk, calculated using the number of fetuses at risk for cerebral palsy at the particular gestational age as the denominator. ¶ excluding live births with missing/unknown gestational age.