This study aimed to validate the Morningness-Eveningness-Stability-Scale improved (MESSi) in Mexico, analyzing the factor structure and sleep habits, combined with the proposal of cutoff values for the scales, and to assess the relationship with substance use. We applied the questionnaires through an online survey to a total sample of 510 Mexicans, aged 18-77 years (M = 27.79, SD = 10.24). The MESSi showed an acceptable fit and the Cronbach's alpha coefficients were good to satisfactory in the Mexican sample in every subscale: Morning Affect (MA, α = 0.90), Eveningness (EV, α = 0.88), Distinctness (DI, α = 0.80). In order to obtain a better interpretation of the MESSi subscales, we decided to propose cutoff points corresponding to the 25th-75th percentile. The categories were depicted as strong trait presence, intermediate trait presence and weak trait presence. When applying the cutoff points for the MESSi sub-scales, with Morning Affect (MA), strong-types went to bed and woke up earlier and had more sleep than weak-types during weekdays and weekends and reported less social jetlag. For Eveningness (EV), strong-types went to bed and woke up later than weak-types on weekdays and weekends. Also, strong-types had a shorter time in bed during weekdays but not on weekends and reported more social jetlag. Lastly, with Distinctness (DI), the results reported that those with a strong-type showed greater amplitude on weekdays and weekends. Furthermore, the MESSi scale found that evening people consumed more alcohol and tobacco. Our study supported the validity and reliability of the MESSi in a Mexican population and the relationship between eveningness and substance consumption. Furthermore, the proposed cutoff scores for the MESSi sub-scales add a novel approach for the measurement and interpretation of the scale.

中文翻译：

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墨西哥人群的睡眠习惯、昼夜节律偏好和物质使用：改善晨间-晚间-稳定性-量表 (MESSi) 的使用。

本研究旨在验证墨西哥的早晨 - 晚上 - 稳定性 - 改善量表（MESSi），分析因素结构和睡眠习惯，结合量表的截止值的建议，并评估与物质使用的关系。我们通过在线调查将问卷应用于 510 名年龄在 18-77 岁之间的墨西哥人的总样本（M = 27.79，SD = 10.24）。MESSi 显示出可接受的拟合，并且 Cronbach α 系数在墨西哥样本的每个子量表中都令人满意：早晨影响 (MA, α = 0.90)、傍晚 (EV, α = 0.88)、差异性 (DI, α = 0.80) . 为了更好地解释 MESSi 分量表，我们决定提出对应于第 25-75 个百分位数的截止点。这些类别被描述为强烈的特质存在，中性特征存在和弱特征存在。当应用 MESSi 子量表的截止点时，使用早晨影响 (MA)，强类型的人在工作日和周末上床睡觉和起床更早，比弱类型的睡眠更多，并且报告的社交时差更少。对于晚上 (EV)，强类型在工作日和周末比弱类型上床睡觉和起床晚。此外，强壮的人在工作日的床上时间更短，周末则不然，并且报告更多的社交时差。最后，对于 Distinctness (DI)，结果报告说，那些具有强类型的人在工作日和周末表现出更大的振幅。此外，MESSi 量表发现，晚上人们消耗更多的酒精和烟草。我们的研究支持 MESSi 在墨西哥人群中的有效性和可靠性，以及晚间活动与物质消耗之间的关系。此外，为 MESSi 子量表建议的截止分数为量表的测量和解释增加了一种新方法。