condition mean min max ZT0-3 16.75505 16.16935 17.34075 ZT4-7 19.335900000000002 19.335900000000002 19.335900000000002 ZT8-11 16.9729 16.9729 16.9729 ZT12-15 0 0 0 ZT16-19 18.913249999999998 18.913249999999998 18.913249999999998 ZT20-23 21.60235 21.60235 21.60235