Demographic and FSIQ characteristics of original NIH sample and analyzed sample.

When appropriate, means ± standard deviations are provided.p-values were calculated using the Student's t-test or chi-square test where appropriate.*Based on the US Department of Housing and Urban Development method for comparing family income levels as a function of regional costs of living.**The ‘Other’ category includes American Indian, Alaskan Native, Asian, Native Hawaiian or Other Pacific Islander, and those for which ethnicity or race was not provided or for which parents came from different racial or ethnic background.***WASI IQ data available for only 380 subjects out of 431 that were initially recruited.若适用，将提供均值±标准差。P值（p-value）将在适用场景下采用学生t检验（Student's t-test）或卡方检验（chi-square test）计算。* 本标注基于美国住房与城市发展部（US Department of Housing and Urban Development）提出的、结合地区生活成本对比家庭收入水平的方法。** "其他"类别涵盖美洲印第安人、阿拉斯加原住民、亚洲人、夏威夷原住民或其他太平洋岛民，以及未提供种族或族裔信息，或父母来自不同种族/族裔背景的受试者。*** 初始招募的431名受试者中，仅380人拥有韦氏简智力量表（WASI）的智商数据。