USAID has published a resume of result from an interventional study of waste management in Namibia.

Make your own minds up. Though a massive improvement in standards is claimed, from only 2% to 98% of hospitals having access to sharps bins, looking at the data the interventions from 2009 onward made no difference. Once access to a functional incinerator was provided, in 2009, things remained relatively stable, though the mean of spirit might suggest from the graphs that indeed they have dipped just ever so slightly.