condition mean min max ZT0-3 48.67785 48.67785 48.67785 ZT4-7 35.80435 35.80435 35.80435 ZT8-11 39.221000000000004 39.221000000000004 39.221000000000004 ZT12-15 26.9259 26.9259 26.9259 ZT16-19 34.745549999999994 34.745549999999994 34.745549999999994 ZT20-23 35.094800000000006 35.094800000000006 35.094800000000006