condition mean min max ZT0-3 617.103988 617.103988 617.103988 ZT4-7 461.1261825 461.1261825 461.1261825 ZT8-11 211.72468099999998 211.72468099999998 211.72468099999998 ZT12-15 375.5705555 375.5705555 375.5705555 ZT16-19 163.4499405 163.4499405 163.4499405 ZT20-23 98.8305055 98.8305055 98.8305055