condition mean min max ZT0-3 12.8 12.8 12.8 ZT4-7 28.2 28.2 28.2 ZT8-11 32.4 32.4 32.4 ZT12-15 7.550000000000001 7.550000000000001 7.550000000000001 ZT16-19 17.25 17.25 17.25 ZT20-23 18.200000000000003 18.200000000000003 18.200000000000003