condition mean min max ZT0-3 5.562308333333333 3.7795699999999997 6.525655 ZT4-7 1.49393 1.49393 1.49393 ZT8-11 24.645699999999998 24.645699999999998 24.645699999999998 ZT12-15 15.519 11.39715 19.64085 ZT16-19 9.795635 9.795635 9.795635 ZT20-23 7.72715 7.72715 7.72715