condition mean min max ZT0-3 1.5501033333333332 0.0 4.650309999999999 ZT4-7 4.36974 4.36974 4.36974 ZT8-11 9.04225 9.04225 9.04225 ZT12-15 5.7012725 4.50704 6.895505 ZT16-19 4.20766 4.20766 4.20766 ZT20-23 0.0 0.0 0.0