condition mean min max ZT0-3 44.05 44.05 44.05 ZT4-7 14.7 14.7 14.7 ZT8-11 33.45 33.45 33.45 ZT12-15 59.45 59.45 59.45 ZT16-19 22.900000000000002 22.900000000000002 22.900000000000002 ZT20-23 9.5 9.5 9.5