condition mean min max ZT0-3 0.20153516666666668 0.1354255 0.333446 ZT4-7 0.13998850000000002 0.13998850000000002 0.13998850000000002 ZT8-11 0.32295549999999995 0.32295549999999995 0.32295549999999995 ZT12-15 0.45564 0.333213 0.578067 ZT16-19 0.4347475 0.4347475 0.4347475 ZT20-23 0.371487 0.371487 0.371487