Body mass and early life mortality in rhesus macaques

Uploaded are 3 datasets used for the analyses presented in the article 'Higher early life mortality with lower infant body mass in a free-ranging primate'. <br>The data was collected from in a population of free-ranging rhesus macaques on Cayo Santiago.<br> All 3 datasets contain information on: 'mab' = maternal age at birth (years; standardized); 'wt' = infant body mass measured prior to weaning (standardized within age-sex category; see the paper for specific method); 'rank' = maternal rank (low/middle/high as 0/1/2); 'fchild' = whether a child was a first-born offspring (1) or not (0); 'centbd' = birth date centered at the peak birth date of a birth season; 'bs' = birth season number; 'newid' = maternal ID.<br><br>1) weight_time_to_death.csvThe data contains 2 additional variables: 'ttd' = time to death (days), assessed up to the first 4 years of life; 'ttd_observed' = whether the time to death was censored or not.<br>2) weight_birthskipping.csvThe data contains 1 additional variable: 'skipped' = whether a mother failed (1) or not (0) to reproduce again in the consequent year. 3) weight_lastsuckle.csvThe data contains 1 additional variable: 'lastsuck' = postpartum week at which the offspring was observed to suckle for the last time (see the paper for detailed method for assessing the last week of suckling). Note that this dataset does not contain information on maternal ID and birth season, because there is no repeated observation within each categories.

本次上传的3个数据集，用于支撑论文《自由放养灵长类动物幼崽体质量越低则早期死亡率越高》中的相关分析工作。本数据集采集自位于卡约圣地亚哥（Cayo Santiago）的自由放养恒河猴（rhesus macaque）种群。所有3个数据集均包含以下变量信息：
- mab：分娩时母亲年龄（单位：年，经标准化处理）
- wt：断乳前测得的幼崽体质量（按年龄-性别分组完成标准化处理，具体方法参见论文）
- rank：母亲社会等级（低、中、高等级分别对应编码0、1、2）
- fchild：幼崽是否为首胎（1代表是首胎，0代表非首胎）
- centbd：以分娩季峰值分娩日期为基准的中心化分娩日期
- bs：分娩季编号
- newid：母亲个体编号（maternal ID）

1) weight_time_to_death.csv：该数据集额外包含2个变量：
- ttd：幼崽出生后前4年内的距死亡时长（单位：天，观测范围限定为幼崽出生首4年）
- ttd_observed：用于标记距死亡时长是否为删失（censored）观测值

2) weight_birthskipping.csv：该数据集额外包含1个变量：
- skipped：标记母亲在后续年度是否未再次繁殖（1代表未再次繁殖，0代表已再次繁殖）

3) weight_lastsuckle.csv：该数据集额外包含1个变量：
- lastsuck：幼崽最后一次被观测到吮吸乳汁的产后周数（最后一次吮吸周数的具体评估方法参见论文）
需注意，本数据集未包含母亲个体编号与分娩季信息，因该数据集不存在同一类别的重复观测记录。