condition mean min max ZT0-3 1.00705572125 0.683850625 1.3302608175 ZT4-7 2.1602724995 1.8239635125 2.4965814865000002 ZT8-11 3.4934945235 2.905255015 4.081734032 ZT12-15 4.88124943425 4.8629631065000005 4.899535762 ZT16-19 4.47784567 4.0817583299999995 4.87393301 ZT20-23 8.219013415000001 6.719518775 9.718508055000001