condition mean min max ZT0-3 0.366378333 0.20216618100000003 0.530590485 ZT4-7 0.6278902104999999 0.29549358649999996 0.9602868345 ZT8-11 0.63359010975 0.3290237505 0.9381564689999999 ZT12-15 0.49669812775 0.457511821 0.5358844345 ZT16-19 1.41878888925 1.3812325395 1.456345239 ZT20-23 2.8904012669999997 2.835688304 2.9451142299999997