Table 1.

Criteria for BBS diagnosis modified by Beales et al

Primary Features	Frequency %	Secondary Features	Frequency %
Rod-cone dystrophy	93	Developmental delay	50–91
Obesity	72–92	Dental anomalies	51
Genital anomalies	59–98	Diabetes mellitus	6–48
Polydactyly	63–81	Speech delay	54 – 81
Learning difficulties	61	Brachydactyly/syndactyly	46–100/8– 95
Renal anomalies	53	Anosmia/hyposmia	61
		Ataxia/poor coordination	40 – 86