condition mean min max ZT0-3 9.88402 9.88402 9.88402 ZT4-7 7.55439 7.55439 7.55439 ZT8-11 9.015995 9.015995 9.015995 ZT12-15 11.335139999999999 11.335139999999999 11.335139999999999 ZT16-19 14.909600000000001 14.909600000000001 14.909600000000001 ZT20-23 11.29635 11.29635 11.29635