condition mean min max ZT0-3 7.5073300000000005 6.640895 8.373765 ZT4-7 12.713750000000001 12.713750000000001 12.713750000000001 ZT8-11 14.0138 14.0138 14.0138 ZT12-15 0 0 0 ZT16-19 10.966750000000001 10.966750000000001 10.966750000000001 ZT20-23 14.33595 14.33595 14.33595