While previous, smaller studies have suggested that CP may be declining in VLBW children, this study is the first with the statistical power to accurately detect prevalence trends.

• 以前曾有小范围的研究表明极低出生体重婴儿的脑瘫发病率可能在下降，目前的研究则是第一次借助了统计学方法来精确阐明发病趋势。