condition mean min max ZT0-3 52.29845 47.18955 57.40735 ZT4-7 29.410200000000003 29.410200000000003 29.410200000000003 ZT8-11 17.77265 17.77265 17.77265 ZT12-15 0 0 0 ZT16-19 24.8917 24.8917 24.8917 ZT20-23 33.3478 33.3478 33.3478