condition mean min max ZT0-3 229.287396 229.287396 229.287396 ZT4-7 190.072245 190.072245 190.072245 ZT8-11 192.9834705 192.9834705 192.9834705 ZT12-15 215.8917525 215.8917525 215.8917525 ZT16-19 199.340553 199.340553 199.340553 ZT20-23 219.0070355 219.0070355 219.0070355