condition mean min max ZT0-3 3.9578666975 3.50898356 4.406749835 ZT4-7 3.7312848814999997 2.6645892065 4.7979805565 ZT8-11 13.280559270749999 9.0275577665 17.533560774999998 ZT12-15 15.51296230425 15.000613732 16.0253108765 ZT16-19 10.15720225375 9.1514096995 11.162994808 ZT20-23 14.36180885 13.981817535000001 14.741800164999999