condition mean min max ZT0-3 11.43385 11.20125 11.66645 ZT4-7 9.43211 9.43211 9.43211 ZT8-11 9.211925 9.211925 9.211925 ZT12-15 0 0 0 ZT16-19 11.561399999999999 11.561399999999999 11.561399999999999 ZT20-23 11.47075 11.47075 11.47075