condition mean min max ZT0-3 0.8648906666666667 0.7788204999999999 0.9657185 ZT4-7 0.8366210000000001 0.8366210000000001 0.8366210000000001 ZT8-11 0.3620635 0.3620635 0.3620635 ZT12-15 0.5592287499999999 0.509059 0.6093985 ZT16-19 0.21738505000000002 0.21738505000000002 0.21738505000000002 ZT20-23 0.783119 0.783119 0.783119