condition mean min max ZT0-3 9.028612162750001 7.840068362999999 10.217155962500001 ZT4-7 5.29081078575 5.033542647 5.5480789244999995 ZT8-11 5.153010452 4.7313643405 5.5746565635 ZT12-15 4.9940038197500005 4.6072100355 5.3807976040000005 ZT16-19 10.14205637775 8.263139825 12.020972930500001 ZT20-23 18.97103985 17.15614205 20.78593765