Sample Characteristics and Attrition in the Young Finns Study.

Note: p-value is from t- or chi-squared test for the difference between the study and attrition samples, and s.d. denotes standard deviation. Attrition sample consists of participants who lacked information either regarding depression or regarding sleep. Some had one but not other, allowing comparison against those with both. For such cases, n denotes sample size for this sub-sample.

注：本研究中的p值（p-value）通过t检验或卡方检验计算得到，用于检验研究样本与失访样本（attrition sample）之间的差异；s.d.（standard deviation）即标准差。失访样本由缺失抑郁或睡眠相关信息的参与者构成，其中部分参与者仅缺失其中一项指标的相关信息，可与两项指标信息均完整的参与者进行对照。针对此类子样本，n代表该子样本的样本量。