condition mean min max ZT0-3 185.424162 185.424162 185.424162 ZT4-7 875.600572 875.600572 875.600572 ZT8-11 1096.895634 1096.895634 1096.895634 ZT12-15 616.231991 616.231991 616.231991 ZT16-19 306.094344 306.094344 306.094344 ZT20-23 315.39730000000003 315.39730000000003 315.39730000000003