condition mean min max ZT0-3 5.05 5.05 5.05 ZT4-7 10.2 10.2 10.2 ZT8-11 13.0 13.0 13.0 ZT12-15 13.05 13.05 13.05 ZT16-19 40.900000000000006 40.900000000000006 40.900000000000006 ZT20-23 21.9 21.9 21.9