condition mean min max ZT0-3 39.33125 37.2611 41.4014 ZT4-7 19.8366 19.8366 19.8366 ZT8-11 31.0821 31.0821 31.0821 ZT12-15 0 0 0 ZT16-19 39.9358 39.9358 39.9358 ZT20-23 34.49435 34.49435 34.49435