Objective To determine whether pyloric measurements with ultrasound, that muscle thickness and channel of pyloric, correlated with weight and age in patients with hypertrophic pyloric stenosis (HPS). Methods A retrospective analysis was conducted on 111 cases diagnosed with HPS by operation from 2008 to 2012. Pearson correlation and linear regression analyses were used to determine if there were sta¬tistically signiifcant associations between these combinations of factors:age and pyloric muscle thickness, weight and pyloric muscle thickness, age and pyloric length, and weight and pyloric length. Results Patients’mean age was 39.1 d (8-92 days). Their mean weight was 4.3 kg (2.2-7.9 kg). Mean pyloric muscle thickness was 4.8 mm (2-4.6 mm), and mean pyloric length was 17.5 mm (12-23.5 mm). Pearson correlation coefifcient analysis showed a signiifcant correlation between age and muscle thickness (r=0.6, P<0.001) as well as weight and muscle thickness (r=0.486, P<0.001). No signiifcant correlation was found be¬tween pyloric length and age or weight. Linear regression analysis demonstrated similar results. Conclusions In patients with HPS, pyloric muscle thickness was directly related to age and weight. Smaller and younger infants with suspected diagnosis of HPS should be followed up even though the minimum diagnostic criterion for muscle thickness or length was not found on ultrasound.%目的：探讨肥厚性幽门狭窄(HPS)患儿幽门肌层厚度和幽门管长度与患儿年龄和体质量间的相关性。方法回顾性分析手术确诊的111例HPS患儿，超声测量幽门肌层厚度及幽门管长度资料及其与年龄和体质量间相关性。结果 Pearson相关分析显示HPS患儿幽门肌层厚度与年龄和体质量有显著相关性(r=0.60、0.49，P<0.01)，而幽门管长度与年龄和体质量间无相关性(r=0.13、0.02，P=0.177、0.868)。结论 HPS患儿的幽门肌层厚度与年龄和体质量直接相关，提示对于年龄较小和（或）体质量较轻的疑似HPS新生儿，其肌层厚度和幽门管长度未达HPS的超声诊断标准时，可进行随访复查。
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