condition mean min max ZT0-3 61.35 61.35 61.35 ZT4-7 5.3 5.3 5.3 ZT8-11 15.0 15.0 15.0 ZT12-15 14.100000000000001 14.100000000000001 14.100000000000001 ZT16-19 22.3 22.3 22.3 ZT20-23 22.7 22.7 22.7