condition mean min max ZT0-3 31.6 31.6 31.6 ZT4-7 60.7 60.7 60.7 ZT8-11 24.450000000000003 24.450000000000003 24.450000000000003 ZT12-15 42.35 42.35 42.35 ZT16-19 17.1 17.1 17.1 ZT20-23 58.15 58.15 58.15