condition mean min max ZT0-3 2.0364275000000003 1.9004249999999998 2.1724300000000003 ZT4-7 2.416295 2.416295 2.416295 ZT8-11 8.326495 8.326495 8.326495 ZT12-15 0 0 0 ZT16-19 8.336134999999999 8.336134999999999 8.336134999999999 ZT20-23 3.812715 3.812715 3.812715