condition mean min max ZT0-3 125.43137 125.43137 125.43137 ZT4-7 85.623239 85.623239 85.623239 ZT8-11 78.289367 78.289367 78.289367 ZT12-15 70.5036035 70.5036035 70.5036035 ZT16-19 63.786412 63.786412 63.786412 ZT20-23 67.375374 67.375374 67.375374