condition mean min max ZT0-3 23.2 23.2 23.2 ZT4-7 23.1 23.1 23.1 ZT8-11 37.25 37.25 37.25 ZT12-15 24.200000000000003 24.200000000000003 24.200000000000003 ZT16-19 8.65 8.65 8.65 ZT20-23 39.55 39.55 39.55