condition mean min max ZT0-3 111.69999999999999 111.69999999999999 111.69999999999999 ZT4-7 16.7 16.7 16.7 ZT8-11 113.9 113.9 113.9 ZT12-15 79.25 79.25 79.25 ZT16-19 74.25 74.25 74.25 ZT20-23 139.64999999999998 139.64999999999998 139.64999999999998