condition mean min max ZT0-3 74.5121 74.5121 74.5121 ZT4-7 63.88675 63.88675 63.88675 ZT8-11 56.371449999999996 56.371449999999996 56.371449999999996 ZT12-15 50.199349999999995 50.199349999999995 50.199349999999995 ZT16-19 83.5726 83.5726 83.5726 ZT20-23 82.72003333333333 82.72003333333333 82.72003333333333