condition mean min max ZT0-3 10.2224575 9.710435 10.734480000000001 ZT4-7 8.482295 8.482295 8.482295 ZT8-11 7.855205 7.855205 7.855205 ZT12-15 0 0 0 ZT16-19 14.47315 14.47315 14.47315 ZT20-23 8.851645000000001 8.851645000000001 8.851645000000001