condition mean min max ZT0-3 10.2788 10.2788 10.2788 ZT4-7 9.616675 9.616675 9.616675 ZT8-11 8.354795 8.354795 8.354795 ZT12-15 8.347945 8.347945 8.347945 ZT16-19 11.152000000000001 11.152000000000001 11.152000000000001 ZT20-23 10.16685 10.16685 10.16685