condition mean min max ZT0-3 5.656057499999999 5.5281649999999996 5.78395 ZT4-7 7.873704999999999 7.873704999999999 7.873704999999999 ZT8-11 7.5463499999999994 7.5463499999999994 7.5463499999999994 ZT12-15 0 0 0 ZT16-19 8.89663 8.89663 8.89663 ZT20-23 9.01611 9.01611 9.01611