Table 1.

Phenotypic classification of study participants.

Participant	Ataxia (<8 yrs)	Loss of walking (<15 yrs)	Oculomotor ataxia (<15 yrs)	Ocular telangiectasia (<15 yrs)	IgA deficiency	Clinical immuno-deficiency	% Criteria	Type of AT based on % criteria	Age (years)
AT002	Yes	Yes	NK	NK	Yes	No	0.75	Classic	26
AT005	Yes	Yes	Yes	Yes	NK	No	0.80	Classic	29
AT006	Yes	Yes	Yes	Yes	No	No	0.67	Classic	12
AT007	Yes	Yes	Yes	Yes	Yes	No	0.83	Classic	14
AT008	Yes	Yes	Yes	Yes	Yes	No	0.83	Classic	12
AT001	Yes	No	NK	NK	No	No	0.25	Mild	33
AT003	Yes	No	Yes	Yes	No	No	0.50	Mild	29
AT004	Yes	No	NK	Yes	NK	No	0.50	Mild	31
AT009WT	—	—	—	—	—	—	—	WT	21
AT010WT	—	—	—	—	—	—	—	WT	26
AT011WT	—	—	—	—	—	—	—	WT	26
AT012WT	—	—	—	—	—	—	—	WT	31

NK: not known; WT: wild type.