condition mean min max ZT0-3 449.10107168999997 69.94995668 828.2521866999999 ZT4-7 1161.48752835 1145.1341307 1177.840926 ZT8-11 506.5977947075 282.40636706500004 730.7892223499999 ZT12-15 11.5367388545 3.1078463060000003 19.965631403 ZT16-19 26.045860451000003 13.761520877 38.330200025 ZT20-23 48.942657085 45.49868367 52.3866305