condition mean min max ZT0-3 29.35 29.35 29.35 ZT4-7 19.6 19.6 19.6 ZT8-11 21.85 21.85 21.85 ZT12-15 16.35 16.35 16.35 ZT16-19 28.5 28.5 28.5 ZT20-23 14.450000000000001 14.450000000000001 14.450000000000001