condition mean min max ZT0-3 411.693595 411.693595 411.693595 ZT4-7 430.121505 430.121505 430.121505 ZT8-11 443.472897 443.472897 443.472897 ZT12-15 437.6629785 437.6629785 437.6629785 ZT16-19 445.66576699999996 445.66576699999996 445.66576699999996 ZT20-23 566.7606995 566.7606995 566.7606995