condition mean min max ZT0-3 11.414461666666668 5.4359850000000005 15.304300000000001 ZT4-7 6.844635 6.844635 6.844635 ZT8-11 5.102824999999999 5.102824999999999 5.102824999999999 ZT12-15 8.590657499999999 6.841419999999999 10.339895 ZT16-19 10.81755 10.81755 10.81755 ZT20-23 14.669550000000001 14.669550000000001 14.669550000000001