condition mean min max ZT0-3 1609.292987 1609.292987 1609.292987 ZT4-7 1273.24719 1273.24719 1273.24719 ZT8-11 975.413277 975.413277 975.413277 ZT12-15 1249.839829 1249.839829 1249.839829 ZT16-19 909.2946985 909.2946985 909.2946985 ZT20-23 782.315038 782.315038 782.315038