condition mean min max ZT0-3 207.45133333333334 189.831 223.56400000000002 ZT4-7 215.9755 215.9755 215.9755 ZT8-11 249.05 249.05 249.05 ZT12-15 239.2115 225.59550000000002 252.8275 ZT16-19 281.7125 281.7125 281.7125 ZT20-23 271.09950000000003 271.09950000000003 271.09950000000003