condition mean min max ZT0-3 75.55655 75.55655 75.55655 ZT4-7 64.28395 64.28395 64.28395 ZT8-11 57.793899999999994 57.793899999999994 57.793899999999994 ZT12-15 66.158 66.158 66.158 ZT16-19 60.41285 60.41285 60.41285 ZT20-23 64.9517 64.9517 64.9517