Table 2.

Diagnostician and age of diagnosis.

Classic RTT
Diagnostician	Number	Percent	Median Age (y)	Interquartile Range	Minimum Age	Maximum Age	Mean Rank*
Pediatrician	48	5.2%	2.4	1.8–3.5	1.2	18.1	379.4
Developmental pediatrician	273	29.7%	3.0	2.0–4.2	0.6	34.1	465.0
Neurologist	324	35.3%	2.7	2.0–4.4	0.8	31.0	446.0
Geneticist	204	22.2%	2.5	2.0–3.5	0.9	40.0	415.6
Other specialist	23	2.5%	2.8	2.1–4.5	1.5	14.8	465.8
Other primary care provider	2	0.2%	n.c.	n.c.	3.1	20.0	703.8
Family member or teacher	12	1.3%	3.3	2.0–13.7	1.3	53.0	530.3
Missing	16	1.7%
Overall	919	100.0%	2.7	2.0–4.1	0.6	53.0
Atypical RTT
Diagnostician	Number	Percent	Median Age (y)	Interquartile Range	Minimum Age	Maximum Age	Mean Rank*
Pediatrician	4	2.4%	5.7	1.6–35.4	1.5	44.1	84.0
Developmental pediatrician	50	30.1%	5.1	2.5–8.1	1.4	37.1	90.1
Neurologist	55	33.1%	3.5	2.4–6.1	1.0	30.8	76.5
Geneticist	44	26.5%	2.9	2.1–5.1	0.7	27.0	67.2
Other specialist	3	1.8%	7.0	n.c.	5.3	10.0	120.8
Other primary care provider	1	0.6%	25.8	n.c.	n.c.	n.c.	154.0
Family member or teacher	1	0.6%	8.0	n.c.	n.c.	n.c.	128.0
Missing	8	4.8%
Overall	166	100.0%	3.8	2.3–6.9	0.7	44.0

^*p = .06, n.c. = not calculated