condition mean min max ZT0-3 12.565847166666666 0.2571805 35.13565 ZT4-7 12.9103 12.9103 12.9103 ZT8-11 2.752415 2.752415 2.752415 ZT12-15 6.7708325 4.42723 9.114435 ZT16-19 1.388315 1.388315 1.388315 ZT20-23 0.5516095000000001 0.5516095000000001 0.5516095000000001