condition mean min max ZT0-3 81.372308 81.372308 81.372308 ZT4-7 136.2773035 136.2773035 136.2773035 ZT8-11 175.648077 175.648077 175.648077 ZT12-15 126.262768 126.262768 126.262768 ZT16-19 100.597373 100.597373 100.597373 ZT20-23 92.0404025 92.0404025 92.0404025