condition mean min max ZT0-3 8.487217981166667 5.440450477000001 11.533985485333334 ZT4-7 25.212396051666666 23.344188413333335 27.08060369 ZT8-11 36.774653210000004 36.50254076 37.046765660000005 ZT12-15 21.539842863333334 20.488470306666667 22.59121542 ZT16-19 18.088792400000003 16.232121693333333 19.94546310666667 ZT20-23 13.16428427 12.095474040000001 14.2330945