condition mean min max ZT0-3 0.140845575 0.056810150000000004 0.224881 ZT4-7 0.0568978 0.0568978 0.0568978 ZT8-11 0.0280774 0.0280774 0.0280774 ZT12-15 0 0 0 ZT16-19 0.055855249999999995 0.055855249999999995 0.055855249999999995 ZT20-23 0.02795055 0.02795055 0.02795055