condition mean min max ZT0-3 30.7863 21.771349999999998 43.73445 ZT4-7 53.304199999999994 53.304199999999994 53.304199999999994 ZT8-11 61.50475 61.50475 61.50475 ZT12-15 64.4164 63.25715 65.57565 ZT16-19 55.97235 55.97235 55.97235 ZT20-23 36.09625 36.09625 36.09625