condition mean min max ZT0-3 862.991701625 321.62098629999997 1404.3624169500001 ZT4-7 3096.5187269999997 2563.07618 3629.961274 ZT8-11 2956.9842707499997 2497.358265 3416.6102764999996 ZT12-15 759.5222111 371.7742597 1147.2701625000002 ZT16-19 185.354105375 151.73113304999998 218.9770777 ZT20-23 184.2607885475 125.407353195 243.1142239