Pain drawings in somatoform-functional pain

Table 3 Odds ratio of Frequent drawing criteria in somatoform-functional vs. somatic-nociceptive pain on logistic regression

Pain drawing criteria	Analysis 1		Analysis 2
	Adjusted for age and gender		Adjusted for age, gender, pain duration, pain severity and mood
	OR	95% CI	OR	95% CI
1. Number of marked pain regions	2.39	1.59-3.60	4.64	1.64-13.1
2. Total number of marks	1.84	1.37-2.48	4.42	1.61-12.13
3. Number of different types of marks	3.93	2.08-7.44	3.65	1.27-10.54
4. Number of affected quadrants	3.74	2.22-6.27	3.97	1.62-9.72
5. Number of symmetric marks	2.66	1.61-4.40	3.49	1.48-8.26
6. Number of “over the border” marks	1.50	1.03-2.18	1.72	0.95-3.10
7. Length of the longest mark, mm	1.57	1.25-1.98	1.52	1.07-2.16
8. Symmetric patterns yes, %	19.6	6.46-59.38	21.94	3.59-134.11
9. Neck involved yes, %	53.95	11.29-257.78	140.4	7.80-2527.29
10. Circle mark yes, %	0.56	0.21-1.55	0.31	0.05-1.77
11. Point mark yes, %	12.32	2.55-59.53	9.46	0.76-118.02
12. Long lines yes, %	22.99	6.12-86.39	16.94	2.22-129.38
13. Strict horizontal lines yes, %	0.074	0.01-0.62	0.08	0.00-1.71
14. Hatching mark yes, %	3.72	1.33-10.42	8.66	1.56-48.14

Explanations for models adjusted for age and gender:
For categorical variables (yes, no) odds ratios indicate the following: if e.g. criterion no.11 (point mark) was present, the odds of a patient suffering from somatoform pain was 12-fold higher than suffering from somatic pain.
For continuous variables odds ratios indicate the following: e.g. for one additional mark (e.g. criterion no. 2) the odds of the patient suffering from somatoform pain as opposed to somatic pain was increased by factor 1.84.
Criterion no.7 (longest mark) was measured in 5 mm steps: For every increase of the length of the longest mark by 5 mm, the odds of the patient suffering from somatoform as opposed to somatic pain was increased by factor 1.57.
Bold figures: pain drawing criteria with OR > 3.

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