condition mean min max ZT0-3 2.67218 2.67218 2.67218 ZT4-7 1.64763 1.64763 1.64763 ZT8-11 1.821175 1.821175 1.821175 ZT12-15 2.188575 2.188575 2.188575 ZT16-19 2.790625 2.790625 2.790625 ZT20-23 2.8075400000000004 2.8075400000000004 2.8075400000000004