condition mean min max ZT0-3 7994.605378 7994.605378 7994.605378 ZT4-7 10956.107585 10956.107585 10956.107585 ZT8-11 9877.4791365 9877.4791365 9877.4791365 ZT12-15 8796.143951499998 8796.143951499998 8796.143951499998 ZT16-19 9780.219925000001 9780.219925000001 9780.219925000001 ZT20-23 6699.2632285 6699.2632285 6699.2632285