condition mean min max ZT0-3 15.0 15.0 15.0 ZT4-7 5.8 5.8 5.8 ZT8-11 10.100000000000001 10.100000000000001 10.100000000000001 ZT12-15 37.8 37.8 37.8 ZT16-19 14.85 14.85 14.85 ZT20-23 29.549999999999997 29.549999999999997 29.549999999999997