ADIS16475 DELTA ANGLES

Good afternoon,
I've been working on 16475.Now, I want to get the DELTA ANGLES by reading the X_DELTANG_OUT, Y _DELTANG_OUT, and Z_DELTANG_OUT registers.But I failed.By the way ,I want to know whether the DELTA ANGLES's data is16 bits or 32 bits?By the way, how can I get the right DELTA ANGLES's data?
Thank you very much!!!