condition mean min max ZT0-3 12.166556 12.166556 12.166556 ZT4-7 12.7202295 12.7202295 12.7202295 ZT8-11 12.871275 12.871275 12.871275 ZT12-15 15.205541499999999 15.205541499999999 15.205541499999999 ZT16-19 12.137292 12.137292 12.137292 ZT20-23 13.4202475 13.4202475 13.4202475