condition mean min max ZT0-3 174.2 174.2 174.2 ZT4-7 169.4 169.4 169.4 ZT8-11 135.95 135.95 135.95 ZT12-15 155.1 155.1 155.1 ZT16-19 137.45 137.45 137.45 ZT20-23 166.1 166.1 166.1