condition mean min max ZT0-3 7.00242 3.6503449999999997 10.52042 ZT4-7 3.0212399999999997 3.0212399999999997 3.0212399999999997 ZT8-11 4.0365425 4.0365425 4.0365425 ZT12-15 13.603 13.5579 13.6481 ZT16-19 13.63985 13.63985 13.63985 ZT20-23 13.479 13.479 13.479