condition mean min max ZT0-3 21.65 21.65 21.65 ZT4-7 21.1 21.1 21.1 ZT8-11 22.450000000000003 22.450000000000003 22.450000000000003 ZT12-15 27.1 27.1 27.1 ZT16-19 23.4 23.4 23.4 ZT20-23 29.3 29.3 29.3