condition mean min max ZT0-3 9.395685 9.266079999999999 9.52529 ZT4-7 8.512350000000001 8.512350000000001 8.512350000000001 ZT8-11 25.3355 25.3355 25.3355 ZT12-15 0 0 0 ZT16-19 20.344450000000002 20.344450000000002 20.344450000000002 ZT20-23 14.6643 14.6643 14.6643