condition mean min max ZT0-3 1.9224825 1.674995 2.16997 ZT4-7 1.7183249999999999 1.7183249999999999 1.7183249999999999 ZT8-11 1.411445 1.411445 1.411445 ZT12-15 0 0 0 ZT16-19 1.558845 1.558845 1.558845 ZT20-23 1.8685649999999998 1.8685649999999998 1.8685649999999998