condition mean min max ZT0-3 5.1000000000000005 5.1000000000000005 5.1000000000000005 ZT4-7 16.6 16.6 16.6 ZT8-11 9.1 9.1 9.1 ZT12-15 19.2 19.2 19.2 ZT16-19 29.35 29.35 29.35 ZT20-23 17.15 17.15 17.15