condition mean min max ZT0-3 20.05 20.05 20.05 ZT4-7 18.6 18.6 18.6 ZT8-11 4.65 4.65 4.65 ZT12-15 13.899999999999999 13.899999999999999 13.899999999999999 ZT16-19 24.4 24.4 24.4 ZT20-23 13.200000000000001 13.200000000000001 13.200000000000001