condition mean min max ZT0-3 29.033775 24.3992 33.66835 ZT4-7 7.513960000000001 7.513960000000001 7.513960000000001 ZT8-11 4.85287 4.85287 4.85287 ZT12-15 0 0 0 ZT16-19 8.7844 8.7844 8.7844 ZT20-23 14.27375 14.27375 14.27375