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As 3rd percentile birth weight of Korean babies born at 36 weeks of gestation is over 2,000 grams,3 VLBWIs born at 36 weeks of gestation are placed at the lowest extreme in birth weight and should have been delivered earlier. Therefore, the high percentage of CP in this gestational age group indicates inadequate prenatal care which should be corrected. In addition, it is not difficult to assume that the number of VLBWIs born at 36 weeks of gestation should be very small. According to the data from Microdata Integrated Service provided by the Statistics Korea, the number of VLBWIs born at 36 weeks of gestation in 2013 and 2014 were 25 (excluding cases reported as 0 gram in the data) and 34, respectively.4 Based on the number of VLBWIs (n = 25) and the rate (proportion = 0.2), we can calculate the exact binomial 95% confidence interval (CI) of the CP rate of VLBWIs born at 36 weeks in 2013 as 0.068–0.407 using the STATA ver 14.0 (STATACorp LLC, College Station, TX, USA). As the statistics were extracted from records of all deliveries in the country, the number in this report would be smaller. Accordingly, although the point estimate of the rate of CP in babies born at 36 weeks of gestation is very high, the CI will be wider. I believe that the 20% of CP rate of VLBWIs born at 36 weeks of gestation should be interpreted in this context. It would be preferable for the authors to present the numbers of CPs and CIs along with point estimate (percent). It should also be mentioned that it is unclear whether the CP rate of VLBWIs born at 36 weeks of gestation in 2014 is indeed 20% which is not evident in Fig. 2, even if 37 is a misprint of 36 in the horizontal axis.

Cerebral Palsy Rate of Very Low Birth Weight Infants Born at 36 Weeks of Gestation