condition mean min max ZT0-3 16.55 16.55 16.55 ZT4-7 29.3 29.3 29.3 ZT8-11 27.55 27.55 27.55 ZT12-15 39.25 39.25 39.25 ZT16-19 11.95 11.95 11.95 ZT20-23 29.9 29.9 29.9