condition mean min max ZT0-3 5.6 5.6 5.6 ZT4-7 62.7 62.7 62.7 ZT8-11 17.950000000000003 17.950000000000003 17.950000000000003 ZT12-15 12.7 12.7 12.7 ZT16-19 13.6 13.6 13.6 ZT20-23 28.200000000000003 28.200000000000003 28.200000000000003