condition mean min max ZT0-3 52.9227 51.8374 54.007999999999996 ZT4-7 44.72185 44.72185 44.72185 ZT8-11 51.30955 51.30955 51.30955 ZT12-15 0 0 0 ZT16-19 56.94245 56.94245 56.94245 ZT20-23 56.19425 56.19425 56.19425