condition mean min max ZT0-3 55.75 55.75 55.75 ZT4-7 37.3 37.3 37.3 ZT8-11 18.1 18.1 18.1 ZT12-15 59.5 59.5 59.5 ZT16-19 14.100000000000001 14.100000000000001 14.100000000000001 ZT20-23 17.05 17.05 17.05