condition mean min max ZT0-3 64.7 64.7 64.7 ZT4-7 32.0 32.0 32.0 ZT8-11 40.85 40.85 40.85 ZT12-15 51.65 51.65 51.65 ZT16-19 70.65 70.65 70.65 ZT20-23 56.15 56.15 56.15