The mental health score were significantly positively related to interpersonal relation , job monotones , role conflict , role ambiguity , job pace , work locus of control , daily life stress scores , times of night shift , and illness ( P < 0.05 or 0.001 ), negatively to task identity , training adequacy , coping strategy , self esteem , organization commitment , support from coworker and family scores ( P < 0.05 or 0.001 ) .