condition mean min max ZT0-3 8.2650225 8.261025 8.26902 ZT4-7 8.61894 8.61894 8.61894 ZT8-11 14.6752 14.6752 14.6752 ZT12-15 0 0 0 ZT16-19 14.3845 14.3845 14.3845 ZT20-23 11.487 11.487 11.487