condition mean min max ZT0-3 1.9260312499999999 1.6464875 2.2055749999999996 ZT4-7 0.5552715 0.5552715 0.5552715 ZT8-11 0.92414 0.92414 0.92414 ZT12-15 0 0 0 ZT16-19 1.136129 1.136129 1.136129 ZT20-23 1.0866605 1.0866605 1.0866605