出生次序（birth order），亦作出生排序或出生排行，是指一个人在兄弟姊妹中的排行顺序。
出生次序和非霍奇金淋巴瘤(NHL)的正相关性是由于早期生活中感染可能性增加影响。
Positive associations between birth order and non-Hodgkin lymphoma (NHL) have been interpreted as an effect of increased likelihood of early-life exposure to infections.
独生子女与非独生子女大学生认知方式差异显著，非独生子女大学生不同出生次序认知方式无显著差异；
Only child college students' cognitive style is different from the non-only-child students. Birth order plays no significant role among non-only children in cognitive style.
低SES与出生次序靠后之间的已知相关性表明SES相关的选择偏差可能影响出生次序和NHL患病风险之间的相关性。
The known correlation of high birth order with low SES suggests that selection bias related to SES may be responsible for the association between birth order and NHL.
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