Patients receiving combination therapy were more likely to have a haemoglobin level of < @ g/dL ( @ % vs. @ % , risk difference ( RD ) : @ % -LSB- @ % CI @ % to @ % -RSB- ; p < @ ) and required a higher dosage -LSB- mean : @,@ vs. @ IU/week , p = @ -RSB- of epoetin to manage anaemia than those receiving monotherapy .