condition mean min max ZT0-3 161.437135 152.27575880000003 170.5985112 ZT4-7 195.76879230000003 178.34939560000004 213.18818900000002 ZT8-11 249.722761175 237.12823205 262.31729029999997 ZT12-15 270.591322775 266.8235535 274.35909205 ZT16-19 318.3380024 292.565032 344.1109728 ZT20-23 249.80139802499997 244.4166263 255.18616974999998