condition mean min max ZT0-3 135.30898 135.30898 135.30898 ZT4-7 163.338351 163.338351 163.338351 ZT8-11 163.97414049999998 163.97414049999998 163.97414049999998 ZT12-15 151.3167195 151.3167195 151.3167195 ZT16-19 111.25739200000001 111.25739200000001 111.25739200000001 ZT20-23 117.9811465 117.9811465 117.9811465