condition mean min max ZT0-3 1.903465 1.81473 1.9922 ZT4-7 0.7863525 0.7863525 0.7863525 ZT8-11 0.7873405 0.7873405 0.7873405 ZT12-15 0 0 0 ZT16-19 1.92754 1.92754 1.92754 ZT20-23 1.825265 1.825265 1.825265