condition mean min max ZT0-3 12.268375 11.7178 12.818950000000001 ZT4-7 7.86265 7.86265 7.86265 ZT8-11 7.4648699999999995 7.4648699999999995 7.4648699999999995 ZT12-15 0 0 0 ZT16-19 12.0328 12.0328 12.0328 ZT20-23 10.009654999999999 10.009654999999999 10.009654999999999