Cranial measurement analysis of 3 406 infants aged 0 to 6 months in Chongqing

Objective\r\nThe incidence and distribution of positional deformities(PD)were studied by measuring cranial types of infants aged 0-6 months of 3 hospitals in Chongqing, and the recommended values of local PD were discussed.\r\n\r\n\r\nMethods\r\nData of 3 406 infants with 0-6 months head size measurements were collected from the Second Affiliated Hospital of Army Military Medical University, Yongchuan Maternal and Child Health Care Hospital and Wanzhou Maternal and Child Health Care Hospital from September 1, 2017 to August 31, 2018, cranial vault asymmetry(CVA)and cranial index(CI)were calculated.According to different age groups, observe the distribution of cranial types, and use the current international common diagnostic criteria to understand the incidence of cranial abnormalities, and analyze the distribution of percentile values of CVA and CI in infants in Chongqing.\r\n\r\n\r\nResults\r\nAccording to the current international standard diagnosis of PD, the incidence of simple brachycephaly was the highest(39.9%)in the overall cranial abnormalities of infants, followed by brachycephaly with plagiocephaly was the second(36.1%), simple plagiocephaly was the lowest(6.9%), and normal cranial type only accounted for 17.1%.The detection rates of plagiocephaly(36.9%)and brachycephaly(67.0%)were the lowest in the 0-2 months group, and the highest in the 3-4 months group(47.3%/83.3%), and then decreased in the 5-6 months group(46.6%/80.2%).\r\n\r\n\r\nConclusion\r\nThe basic values of cranial type measurement of full-term infants in chongqing were significantly different from international reports, mainly due to the large CI value.The general international diagnosis standard for positional deformities do not conform to Chinese infants.We suggest that the reference value for positional deformities in this region is as follows: CVA≥0.4 cm is abnormal, of which 0.4 cm≤CVA\u003c0.6 cm for mild plagiocephaly, 0.6 cm≤CVA\u003c1.0 cm for moderate plagiocephaly, CVA≥1.0 cm for severe plagiocephaly; 82%≤CI≤91% is abnormal, of which 91%≤CI\u003c94% for mild brachycephaly; 94% ≤CI\u003c99% for moderate brachycephaly; CI≥ 99% for severe brachycephaly.CI≤82% is scaphocephaly.\r\n\r\n\r\nKey words: \r\nPositional deformities; Plagiocephaly; Brachycephaly; Normal values