condition mean min max ZT0-3 51.286906 51.286906 51.286906 ZT4-7 41.515111000000005 41.515111000000005 41.515111000000005 ZT8-11 38.2025745 38.2025745 38.2025745 ZT12-15 37.4633855 37.4633855 37.4633855 ZT16-19 42.035475000000005 42.035475000000005 42.035475000000005 ZT20-23 46.17241 46.17241 46.17241