condition mean min max ZT0-3 26.7 26.7 26.7 ZT4-7 48.2 48.2 48.2 ZT8-11 19.45 19.45 19.45 ZT12-15 32.95 32.95 32.95 ZT16-19 31.200000000000003 31.200000000000003 31.200000000000003 ZT20-23 21.150000000000002 21.150000000000002 21.150000000000002