Evidence also suggests that this death rate was not the inevitable consequence of impairment, as many deaths were rooted in socio-economic factors.
Mae’r dystiolaeth hefyd yn awgrymu nad oedd y gyfradd marwolaethau hon yn ganlyniad anochel i nam, gan fod llawer o farwolaethau’n seiliedig ar ffactorau economaidd-gymdeithasol.