Visual estimates of blood loss by medical laypeople: Baseline data

The data material was collected in a controlled experiment that investigated the ability of laypeople to visually assess blood loss and to examine factors that may impact accuracy and the classification of injury severity. A total of 125 laypeople watched 78 short videos each of individuals experiencing a hemorrhage. Victim gender, volume of blood lost, and camera perspective were systematically manipulated in the videos.

The data set consists of four variables: volume estimate, volume error, response time, and classification.

Each variable has a separate sheet in the excel document.

The data is from 125 individuals, each listed on a separate row with a unique ID for each individual.
Each sheet includes the participant ID (anonymous number), age in years, participant sex (0 = male, 1 = female), perspective of the video clip (0 = top view, 1 = front view), and then one column for each victim gender and loss volume combination (24 total). The column label consists of M or F for male and female victim, followed by underscore and the loss volume (e.g., M_50 for male victim with 50 ml of blood loss, or F_1100 for a female victim with 1100 ml of blood loss).

Volume estimates are the participants' estimate of blood loss in ml.
Volume error is the estimate minus the true value, in ml.
Response time is the time it took for participants to classify the bleeding as life-threatening or not, in seconds.
Classification is a value from 0 to 1 for the proportion of times the participant classified that particular gender-volume combination as depicting a life-threatening blood loss .

本数据集的素材源自一项对照实验，该实验旨在探究非专业人士（laypeople）通过视觉评估失血量的能力，并分析可能影响评估准确性与损伤严重程度分级的各类因素。共计125名非专业人士观看了78段展示出血个体的短视频，实验中系统操控了视频中的受害者性别、失血量与拍摄视角三类变量。
本数据集包含四类变量：失血量估计值、失血量误差、反应时长与伤情分类结果。
Excel文档中，每一类变量对应单独的工作表。
数据集共收录125名受试者的数据，每名受试者的信息独占一行，并配有唯一编号。每张工作表均包含受试者编号（匿名编号）、年龄（单位：岁）、受试者性别（0为男性，1为女性）、视频拍摄视角（0为俯视视角，1为正面视角），以及对应所有受害者性别与失血量组合的列（共计24组）。列标签由代表受害者性别的M（男性）或F（女性）、下划线与失血量数值组成，例如M_50代表失血量为50ml的男性受害者，F_1100代表失血量为1100ml的女性受害者。
失血量估计值为受试者估算的失血量，单位为毫升；失血量误差为估算值与真实失血量的差值，单位为毫升；反应时长为受试者判定该出血是否危及生命所花费的时间，单位为秒；伤情分类结果为取值范围0至1的数值，代表受试者将该性别-失血量组合对应的出血判定为危及生命的次数占总评判次数的比例。