# Table 2 Etiopathological factors in order of decreasing frequency

Variables Cases n ( %) Controls n ( %) OR (95 % CI)k p - value
Professional groups n = 58e n = 52e   0.43a
semi-skilled worker 21/58 (36) 12/52 (23)
training occupation 22/58 (38) 27/52 (52)
technical occupation 6/58 (10) 5/52 (10)
academic profession 9/58 (16) 8/52 (15)
Occupational group n = 77d n = 65d   0.23a
manual labor 14/77 (18) 17/65 (26)
administrative work 34/77 (44) 20/65 (31)
neither manual labor nor administrative work 29/77 (38) 28/65 (43)
Occupational hierarchy according to Goldthorp n = 58e n = 52e
I 13/58 (22) 9/52 (17) I – IV vs. V – VII 0.95a
0.7 (0.3 – 1.6)
II 13/58 (22) 11/52 (21)
III 9/58 (16) 7/52 (13)
IV 6/58 (10) 4/52 (8)
V 5/58 (9) 6/52 (12)
VI 6/58 (10) 7/52 (13)
VII 6/58 (10) 8/52 (15)
Working time n = 58e n = 52e
average working hours per week, in hours (range) 34 (7–60) 38 (10–55)   0.05c
Piecework n = 58f n = 52f
daily 4/58 (7) 3/52 (6) Yes vs. never 0.76b
1.6 (0.5 – 5.5)
3/4 of the time 1/58 (2) -
1/2 of the time 1/58 (2) 3/52 (6)
1/4 of the time 2/58 (3) 1/52 (2)
never 50/58 (86) 45/52 (87)
Work with computer n = 58f n = 47f
daily 17/58 (29) 15/47 (32) Yes vs. never 0.99b
1.5 (0.6 – 3.7)
3/4 of the time 2/58 (3) 2/47 (4)
1/2 of the time 4/58 (7) 2/47 (4)
1/4 of the time 12/58 (21) 9/47 (19)
never 23/58 (40) 19/47 (40)
Twisting motions at work n = 58f n = 52f
every hour 11/58 (19) 11/52 (21) Every hour/daily vs. 2–3× per week/ 0.31b
1× per week/never
1.2 (0.6 – 2.8)
daily 14/58 (24) 15/52 (29)
2–3× per week 5/58 (9) -
1× per week 4/58 (7) 3/52 (6)
never 24/58 (41) 23/52 (44)
Powerful motions of the forearm or hand n = 58f n = 47f
every hour 14/58 (24) 8/47 (17) Every hour/daily vs. 2–3× per week/ 0.06b
1× per week/never
1.0 (0.4 – 2.3)
daily 10/58 (17) 15/47 (32)
2–3× per week 4/58 (7) 2/47 (4)
1× per week 2/58 (3) 7/47 (15)
never 28/58 (48) 15/47 (32)
Pulling or pushing of loads n = 58f n = 47f
every hour 3/58 (5) 5/47 (11) Every hour/daily vs. 2–3× per week/ 0.04b
1× per week/never
0.6 (0.3 – 1.5)
daily 8/58 (14) 12/47 (26)
2–3× per week 3/58 (5) -
1× per week 11/58 (19) 2/47 (4)
never 33/58 (57) 28/47 (60)
Ergonomically stressful work n = 58f n = 52f
every hour 7/58 (12) 9/52 (17) Every hour/daily vs. 2–3× per week/ 0.42a
1× per week/never
0.7 (0.3 – 1.5)
daily 10/58 (17) 15/52 (29)
2–3× per week 4/58 (7) 3/52 (6)
1× per week 6/58 (10) 6/52 (12)
never 31/58 (53) 19/52 (37)
Musical instrument n = 77h n = 65h
current 4/77 (5) 7/65 (11) 0.6 (0.1–2.3) 0.35b
former & never 73/77 (95) 58/65 (89)
High impact sports i n = 77h n = 65h
current 39/77 (51) 23/65 (35) 1.8 (0.9–3.7) 0.06b
former & never 38/77 (49) 42/65 (65)
Rheumatoid arthritis
suspicion of rheumatoid arthritis j 0/77 (0) 1/65 (2) - 0.46b
morning stiffness > 1 h 4/77 (5) 14/65 (20) 0.8 (0.1–5.1) 0.01b
arthritis of 3 or more joint areas 3/77 (4) 7/65 (11) 0.4 (0.1–1.6) 0.2b
symmetric arthritis 0/77 (0) 3/65 (4) - 0.1b
Trauma (<2 years before dQ) 2/77 (3) 0/65 (0) - 0.5b
Working time at computer n = 28h n = 30h
Computer use in hours per week 19 (1–40) 16 (1–54)   0.24c
Keyboard n = 28h n = 30h
ergonomic 2/28 (7) 1/30 (3) Laptop vs. PC (normal/ergonomic) 0.88b
0.9 (0.2 – 6.6)
normal 23/28 (82) 25/30 (83)
Laptop 3/28 (11) 4/30 (13)
Mouse n = 28h n = 30h
normal 24/28 (86) 26/30 (87) Touchpad vs. PC-mouse (normal/ergonomic) 0.87b
0.9 (0.1 – 6.4)
ergonomic 2/28 (7) 1/30 (3)