condition mean min max ZT0-3 43.95 43.95 43.95 ZT4-7 32.4 32.4 32.4 ZT8-11 32.85 32.85 32.85 ZT12-15 26.85 26.85 26.85 ZT16-19 29.450000000000003 29.450000000000003 29.450000000000003 ZT20-23 38.4 38.4 38.4