condition mean min max ZT0-3 0.8094533333333334 0.8094533333333334 0.8094533333333334 ZT4-7 0.695533 0.695533 0.695533 ZT8-11 0.5347000000000001 0.5347000000000001 0.5347000000000001 ZT12-15 0.71615 0.71615 0.71615 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0