condition mean min max ZT0-3 754.315999 754.315999 754.315999 ZT4-7 740.997895 740.997895 740.997895 ZT8-11 817.0991235 817.0991235 817.0991235 ZT12-15 792.5732264999999 792.5732264999999 792.5732264999999 ZT16-19 878.1629204999999 878.1629204999999 878.1629204999999 ZT20-23 867.260353 867.260353 867.260353