condition mean min max ZT0-3 65.00616666666666 51.439899999999994 83.98259999999999 ZT4-7 77.1011 77.1011 77.1011 ZT8-11 32.54905 32.54905 32.54905 ZT12-15 5.39471 4.796255 5.993164999999999 ZT16-19 2.923335 2.923335 2.923335 ZT20-23 9.93474 9.93474 9.93474