condition mean min max ZT0-3 320.30898 320.30898 320.30898 ZT4-7 269.2855395 269.2855395 269.2855395 ZT8-11 258.094517 258.094517 258.094517 ZT12-15 342.41258600000003 342.41258600000003 342.41258600000003 ZT16-19 287.53889549999997 287.53889549999997 287.53889549999997 ZT20-23 350.7444285 350.7444285 350.7444285