condition mean min max ZT0-3 2667.6499999999996 2667.6499999999996 2667.6499999999996 ZT4-7 3910.0 3910.0 3910.0 ZT8-11 3368.3500000000004 3368.3500000000004 3368.3500000000004 ZT12-15 4097.6 4097.6 4097.6 ZT16-19 3895.7 3895.7 3895.7 ZT20-23 2968.6000000000004 2968.6000000000004 2968.6000000000004