Table 5.
Incidence of carpal tunnel syndrome (CTS) of the dominant hand for each study. [EDS=electrodiagnostic studies; IR=incident rate; 95% CI=95% confidence interval]
| Study Groups | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | Total | |||||||||
| N | IR | N | IR | N | IR | N | IR | N | IR | N | IR | N | IR | 95% CI | |
| Original population | 482 | 720 | 447 | 346 | 1219 | 1107 | 4321 | ||||||||
| Sample at risk for incident CTS | 357 | 592 | 392 | 294 | 884 | 996 | 3515 | ||||||||
| CTS case definition a | 34 | 47 | 17 | 12 | 70 | 24 | 204 | ||||||||
| Person time (in person years) | 605 | 1145 | 503 | 244 | 2681 | 3657 | 8833 | ||||||||
| Censored due to polyneuropathy b | 6 | 0 | 0 | 0 | 20 | 2 | 28 | ||||||||
| Censored due to symptoms and no EDS c | 5 | 9 | 2 | 0 | 79 | 64 | 159 | ||||||||
| Incident rate (per 100 person years) | 5.6 | 4.1 | 3.4 | 4.9 | 2.6 | 0.7 | 2.3 | 2.0–2.7 | |||||||
a
CTS case definition criteria: median nerve symptoms and median neuropathy of the dominant hand
b
Polyneuropathy 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.
c
Subjects with positive reported symptoms that did not have another electrodiagnostic study (EDS) were censored at the time of the symptoms.