condition mean min max ZT0-3 9.522612500000001 9.004815 10.040410000000001 ZT4-7 6.4712250000000004 6.4712250000000004 6.4712250000000004 ZT8-11 6.64155 6.64155 6.64155 ZT12-15 0 0 0 ZT16-19 8.334800000000001 8.334800000000001 8.334800000000001 ZT20-23 8.841975 8.841975 8.841975