Increased frequency of nightmares is correlated with higher rates of sleep disturbances (e.g., insomnia) and increased severity of psychological distress.
Formal education, the number of children in the home and frequency of paraffin use were positively correlated with knowledge but not with safe practices.
受教育程度、家里儿童的多少和使用煤油的频率与知识呈正相关，但不与安全操作呈正相关。
3
Correlated symptom of disease diagnosis present highest frequency of occurrence.