condition mean min max ZT0-3 261.3670067 202.73451599999999 319.9994974 ZT4-7 223.229402825 189.64645685 256.8123488 ZT8-11 72.45347372 50.737619475 94.169327965 ZT12-15 27.355018359999995 27.156840104999997 27.553196614999997 ZT16-19 73.4761647675 55.777646274999995 91.17468326 ZT20-23 135.030754275 128.39794510000002 141.66356345