condition mean min max ZT0-3 24.0 24.0 24.0 ZT4-7 9.6 9.6 9.6 ZT8-11 15.2 15.2 15.2 ZT12-15 10.1 10.1 10.1 ZT16-19 40.15 40.15 40.15 ZT20-23 15.950000000000001 15.950000000000001 15.950000000000001