condition mean min max ZT0-3 0.2759895 0.1968625 0.3551165 ZT4-7 0.364174 0.364174 0.364174 ZT8-11 0.36143749999999997 0.36143749999999997 0.36143749999999997 ZT12-15 0 0 0 ZT16-19 0.290139 0.290139 0.290139 ZT20-23 0.226542 0.226542 0.226542