condition mean min max ZT0-3 24.63425 14.7657 32.7329 ZT4-7 10.583355 10.583355 10.583355 ZT8-11 10.71804 10.71804 10.71804 ZT12-15 15.352274999999999 12.546 18.158549999999998 ZT16-19 19.6282 19.6282 19.6282 ZT20-23 30.57665 30.57665 30.57665