condition mean min max ZT0-3 50.74055 50.74055 50.74055 ZT4-7 54.302049999999994 54.302049999999994 54.302049999999994 ZT8-11 37.62235 37.62235 37.62235 ZT12-15 35.783950000000004 35.783950000000004 35.783950000000004 ZT16-19 58.17465 58.17465 58.17465 ZT20-23 53.6821 53.6821 53.6821