condition mean min max ZT0-3 3521.3500000000004 3521.3500000000004 3521.3500000000004 ZT4-7 3017.0 3017.0 3017.0 ZT8-11 3247.45 3247.45 3247.45 ZT12-15 3476.55 3476.55 3476.55 ZT16-19 4378.0 4378.0 4378.0 ZT20-23 4627.95 4627.95 4627.95