condition mean min max ZT0-3 66.9497 66.9497 66.9497 ZT4-7 54.164550000000006 54.164550000000006 54.164550000000006 ZT8-11 51.852850000000004 51.852850000000004 51.852850000000004 ZT12-15 54.7038 54.7038 54.7038 ZT16-19 57.4272 57.4272 57.4272 ZT20-23 71.1636 71.1636 71.1636