condition mean min max ZT0-3 18.055300000000003 18.055300000000003 18.055300000000003 ZT4-7 10.61671 10.61671 10.61671 ZT8-11 8.401769999999999 8.401769999999999 8.401769999999999 ZT12-15 11.57406 11.57406 11.57406 ZT16-19 19.4031 19.4031 19.4031 ZT20-23 22.02005 22.02005 22.02005