Table 4.

Prevalence of carpal tunnel syndrome (CTS) of the dominant hand at baseline for each study. [CTR=carpal tunnel release or surgery; MUDS=median-ulnar sensory difference; 95% CI=95% confidence interval]

	Study groups
	A N=482		B N=720		C N=447		D N=346		E N=1219		F N=1107		Total N= 4321
	N	%	N	%	N	%	N	%	N	%	N	%	N	%	95% CI
Prevalent polyneuropathy a	9	1.9	2	0.3	3	0.7	0	0	41	3.8	3	0.3	58	1.4	1.0–1.7
Median nerve symptoms b	105	21.8	107	14.9	56	12.5	30	8.7	293	24.0	66	6.0	657	15.2	14.2–16.3
Median mononeuropathy c	232	48.5	186	25.8	116	26.3	23	6.6	484	45.6	193	17.6	1234	31.0	29.6–32.4
CTS case definition d	60	12.4	45	6.3	23	5.1	21	6.1	125	10.3	29	2.6	303	7.1	6.3–7.8
Prior CTR reported at baseline	5	1.0	3	0.4	6	1.3	1	0.3	22	1.8	0	0.0	37	0.9	0.6–1.1
Prevalent CTS cases e	64	13.3	48	6.7	29	6.6	22	6.4	146	14.0	29	2.6	338	7.8	7.1–8.6

^aPolyneuropathy criteria: onset sensory-recorded wave – CTS case definition AND ulnar sensory latency >3.18 ms; peak sensory-recorded wave CTS case definition AND ulnar sensory latency > 3.68 ms.

^bMedian nerve symptom criteria: numbness, tingling, burning or pain in≥1 digits (thumb, index, long).

^cMedian neuropathy critera: onset sensory-recorded wave – median nerve symptoms AND [(median sensory latency >3.2 ms or absent) or median motor latency > 4.5 ms or MUDS >0.85 ms]; peak sensory-recorded wave – median nerve symptoms and [(median sensory latency >3.7 ms or absent) or median motor latency > 4.5 ms or MUDS >0.85 ms].

^dCTS case definition criteria: median nerve symptoms and median neuropathy of the dominant hand.

^ePrevalent CTS case: CTS case definition or prior CTR reported at baseline.