condition mean min max ZT0-3 990.757613 990.757613 990.757613 ZT4-7 570.824316 570.824316 570.824316 ZT8-11 762.4847515 762.4847515 762.4847515 ZT12-15 513.071178 513.071178 513.071178 ZT16-19 811.847192 811.847192 811.847192 ZT20-23 802.46685 802.46685 802.46685