condition mean min max ZT0-3 2.07723 2.07723 2.07723 ZT4-7 1.2112705 1.2112705 1.2112705 ZT8-11 1.064623 1.064623 1.064623 ZT12-15 1.57048 1.57048 1.57048 ZT16-19 2.04404 2.04404 2.04404 ZT20-23 2.4560750000000002 2.4560750000000002 2.4560750000000002