condition mean min max ZT0-3 14.472519 14.472519 14.472519 ZT4-7 14.960600500000002 14.960600500000002 14.960600500000002 ZT8-11 14.646308000000001 14.646308000000001 14.646308000000001 ZT12-15 13.957580499999999 13.957580499999999 13.957580499999999 ZT16-19 15.128506000000002 15.128506000000002 15.128506000000002 ZT20-23 14.334745000000002 14.334745000000002 14.334745000000002