condition mean min max ZT0-3 0.236896 0.236896 0.236896 ZT4-7 0.17336095 0.17336095 0.17336095 ZT8-11 0.27120299999999997 0.27120299999999997 0.27120299999999997 ZT12-15 0.3873345 0.3873345 0.3873345 ZT16-19 0.8715295 0.8715295 0.8715295 ZT20-23 0.50781 0.50781 0.50781