condition mean min max ZT0-3 4.23863798425 2.1765139565 6.300762012000001 ZT4-7 3.14023927425 2.009224164 4.2712543845 ZT8-11 6.635385611249999 5.315769057 7.9550021655 ZT12-15 13.375783095500001 12.774864616 13.976701575 ZT16-19 14.30428813 14.01551238 14.593063879999999 ZT20-23 8.27750059 5.60915567 10.945845510000002