condition mean min max ZT0-3 64.477025 61.66935 67.2847 ZT4-7 65.98975 65.98975 65.98975 ZT8-11 69.28479999999999 69.28479999999999 69.28479999999999 ZT12-15 0 0 0 ZT16-19 98.4472 98.4472 98.4472 ZT20-23 86.59035 86.59035 86.59035