condition mean min max ZT0-3 40.415274999999994 40.1119 40.71865 ZT4-7 40.900999999999996 40.900999999999996 40.900999999999996 ZT8-11 29.893 29.893 29.893 ZT12-15 0 0 0 ZT16-19 34.6734 34.6734 34.6734 ZT20-23 38.908950000000004 38.908950000000004 38.908950000000004