condition mean min max ZT0-3 4.246840000000001 4.058915 4.4347650000000005 ZT4-7 2.22261 2.22261 2.22261 ZT8-11 4.420155 4.420155 4.420155 ZT12-15 0 0 0 ZT16-19 8.963975 8.963975 8.963975 ZT20-23 6.412225 6.412225 6.412225