condition mean min max ZT0-3 64.810775 64.810775 64.810775 ZT4-7 53.760786499999995 53.760786499999995 53.760786499999995 ZT8-11 60.318171 60.318171 60.318171 ZT12-15 56.885972499999994 56.885972499999994 56.885972499999994 ZT16-19 57.276819 57.276819 57.276819 ZT20-23 63.960725000000004 63.960725000000004 63.960725000000004