condition mean min max ZT0-3 5.737045 4.90227 6.571820000000001 ZT4-7 6.129804999999999 6.129804999999999 6.129804999999999 ZT8-11 24.884500000000003 24.884500000000003 24.884500000000003 ZT12-15 0 0 0 ZT16-19 24.9389 24.9389 24.9389 ZT20-23 12.009 12.009 12.009