condition mean min max ZT0-3 21.630233333333333 20.054650000000002 22.5166 ZT4-7 17.3872 17.3872 17.3872 ZT8-11 15.2967 15.2967 15.2967 ZT12-15 22.252724999999998 21.60315 22.9023 ZT16-19 19.99155 19.99155 19.99155 ZT20-23 21.03295 21.03295 21.03295