condition mean min max ZT0-3 8.55 8.55 8.55 ZT4-7 23.9 23.9 23.9 ZT8-11 24.1 24.1 24.1 ZT12-15 8.25 8.25 8.25 ZT16-19 29.8 29.8 29.8 ZT20-23 23.200000000000003 23.200000000000003 23.200000000000003