信號偵測判斷敏感度平均值男性是1.28，女性是1.15。判斷閾值之平均數男性是0.44，女性是0.53，皆屬於「非保守」之信號偵測反應。二因子變異數分析，性別、年齡與工作經驗對受測者的判斷敏感度及判斷閾值都沒有顯著影響，但是性別與工作經驗對判斷敏感度有顯著的交互作用。 The purpose of this study was to develop an instrument using Signal Detection Theory (SDT) to measure hazard risk perceptions of people in construction site. Four tests (Safety Attitude, Hazard Risk Cognition, Safety Knowledge, and Construction Site Hazard Risk Perception) were designed in this study.
Two-way ANOVA showed that the factors of the gender, age, and years of working did not affect the hazard risk perceptions when the subjects observed the unsafe pictures of the construction site. Six types of major injuries in construction sites were categories in different risk perception levels. The types of injuries in “collapse”, “falls”, “fallen objects” , and “stab, cut, abrasion” were categories in first hazard risk perception level; the second hazard risk perception level was “fires and explosions”, the lowest level was “electric shocks”.
The results of the measure in signal detection, the sensitivity value（d’）of the male and female were 1.28 and 1.15. Two-way ANOVA of the sensitivity value（d’) showed significant interaction between gender and working years. The measure of the signal detection threshold（β）of the male and female were 0.44 and 0.53, meaning both were categories in “non-conservative”.