condition mean min max ZT0-3 29.711683333333333 26.20185 31.803649999999998 ZT4-7 28.5699 28.5699 28.5699 ZT8-11 28.55445 28.55445 28.55445 ZT12-15 48.3571 48.219300000000004 48.4949 ZT16-19 45.909549999999996 45.909549999999996 45.909549999999996 ZT20-23 51.8016 51.8016 51.8016