condition mean min max ZT0-3 11.928650000000001 11.928650000000001 11.928650000000001 ZT4-7 5.99721 5.99721 5.99721 ZT8-11 10.83645 10.83645 10.83645 ZT12-15 13.972650000000002 13.972650000000002 13.972650000000002 ZT16-19 22.1712 22.1712 22.1712 ZT20-23 15.838000000000001 15.838000000000001 15.838000000000001