condition mean min max ZT0-3 2.055609008 1.0578228029999999 3.053395213 ZT4-7 3.7861486812500003 3.7262240485000007 3.846073314 ZT8-11 6.5641592375 4.898021217 8.230297258 ZT12-15 8.4332415495 7.4644832525 9.4019998465 ZT16-19 4.51713411325 3.613294378 5.4209738485 ZT20-23 1.2860813102500002 0.8713853195000001 1.700777301