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ADUM4221 Power dissipation

Hi , 

Could you tell me this is the calculation for Power dissipation? Datasheet the calculation is not clear. 

Data sheet states : 

PDISS_ADuM4221 = PDISS × 0.5(RDSON_P/(RGON + RDSON_P) + 0.5(RDSON_N/(RGOFF + RDSON_N))

Should it be 

PDISS_ADuM4221 = PDISS × (0.5(RDSON_P/(RGON + RDSON_P)) + 0.5(RDSON_N/(RGOFF + RDSON_N)))

Thanking you 

With best regards