condition mean min max ZT0-3 148.587202 148.587202 148.587202 ZT4-7 80.03880699999999 80.03880699999999 80.03880699999999 ZT8-11 75.0054215 75.0054215 75.0054215 ZT12-15 58.766907 58.766907 58.766907 ZT16-19 29.34841 29.34841 29.34841 ZT20-23 42.461098 42.461098 42.461098