MFI and autocritical brain ability were significantly and negatively correlated with PSI (P<0.01).
心理紧张强度与劳动者脑力能力主、客观指标均呈显著负相关关系（P<0.01）。
The air negative ion concentration was significantly negatively correlated with air temperature, and positively correlated with air pressure and relative humidity.
空气负离子浓度与温度呈极显著负相关，与相对湿度、气压呈极显著正相关。
Visibility was significantly correlated with wind speed and temperature, however, it was negatively correlated with relative humidity.
能见度与风速、温度呈显著正相关，与相对湿度呈显著负相关。
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