condition mean min max ZT0-3 0.20156602675000002 0.0454306025 0.357701451 ZT4-7 1.4999241429999999 0.8723934945 2.1274547915 ZT8-11 6.598261802250001 5.7778357585 7.418687846 ZT12-15 12.4920692605 11.057774106 13.926364415 ZT16-19 11.202372061750001 10.4940615735 11.91068255 ZT20-23 10.69527209525 10.093392553000001 11.2971516375