condition mean min max ZT0-3 57.75 57.75 57.75 ZT4-7 38.4 38.4 38.4 ZT8-11 53.55 53.55 53.55 ZT12-15 48.7 48.7 48.7 ZT16-19 65.75 65.75 65.75 ZT20-23 47.05 47.05 47.05