condition mean min max ZT0-3 374.77305157499995 298.1740477 451.37205544999995 ZT4-7 194.11530474999998 163.18308879999998 225.04752069999998 ZT8-11 205.83736084999998 199.1844728 212.49024889999998 ZT12-15 238.54850745 233.14879439999999 243.9482205 ZT16-19 228.55423061666667 226.64666576666667 230.46179546666667 ZT20-23 342.9173319166666 272.00863826666665 413.82602556666666