condition mean min max ZT0-3 22.278619 22.278619 22.278619 ZT4-7 12.3444365 12.3444365 12.3444365 ZT8-11 12.9195975 12.9195975 12.9195975 ZT12-15 12.837152 12.837152 12.837152 ZT16-19 11.429643500000001 11.429643500000001 11.429643500000001 ZT20-23 12.613664 12.613664 12.613664