condition mean min max ZT0-3 9.5114332785 9.231435912 9.791430645 ZT4-7 6.212346413500001 5.459436795 6.965256032 ZT8-11 8.174668732 7.3204335700000005 9.028903893999999 ZT12-15 9.35934952025 9.3439109485 9.374788092 ZT16-19 13.72600624525 10.4188857655 17.033126725 ZT20-23 28.133368094999998 25.003420364999997 31.263315825