condition mean min max ZT0-3 66.55 66.55 66.55 ZT4-7 9.0 9.0 9.0 ZT8-11 17.900000000000002 17.900000000000002 17.900000000000002 ZT12-15 7.25 7.25 7.25 ZT16-19 23.9 23.9 23.9 ZT20-23 38.4 38.4 38.4