Higher risks were independently associated with higher pre-ART weight [ aHR ( per +5 kg ) 1.07 ( 95 % CI 1.01-1 .13 ) ] and older age aHR ( per 10 years older ) 1.29 ( 95 % CI 1.12-1 .49 ) , but there was no significant effect of sex ( P = 0.13 ) , pre-ART CD4 ( + ) cell count ( P = 0.91 ) or CD4 ( + ) cell count monitoring ( P = 0.73 ) .