condition mean min max ZT0-3 155.823699 155.823699 155.823699 ZT4-7 463.237929 463.237929 463.237929 ZT8-11 623.9960980000001 623.9960980000001 623.9960980000001 ZT12-15 384.51123900000005 384.51123900000005 384.51123900000005 ZT16-19 254.190455 254.190455 254.190455 ZT20-23 251.85093 251.85093 251.85093