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Table 7 Inter-item correlation matrix for PHQ-15 (Somatization Disorder Scale)

From: An arabic translation, reliability, and validation of Patient Health Questionnaire in a Saudi sample

PHQ-15 items Item 1 Item 2 Item 3 Item 4 Item 5 Item 6 Item 7 Item 8 Item 9 Item 10 Item 11 Item 12 Item 13 Item 14 Item 15
Stomach pain 1.000
Back pain 0.346 1.000
Pain in your arms, legs, or joints (knees, hips, etc.) 0.288 0.458 1.000
Menstrual cramps or other problems with your periods 0.328 0.255 0.277 1.000
Pain or problems during sexual intercourse 0.021 0.019 0.060 0.101 1.000
Headaches 0.222 0.199 0.253 0.289 −0.031 1.000
Chest pain 0.198 0.221 0.223 0.117 −0.029 0.181 1.000
Dizziness 0.245 0.307 0.321 0.273 0.001 0.323 0.214 1.000
Fainting spells 0.099 0.135 0.130 0.098 −0.011 0.051 0.191 0.172 1.000
Feeling your heart pound or race 0.272 0.222 0.293 0.249 −0.008 0.294 0.289 0.369 0.183 1.000
Shortness of breath 0.241 0.262 0.273 0.230 0.054 0.255 0.346 0.354 0.205 0.484 1.000
Constipation, loose bowels, or diarrhea 0.424 0.221 0.262 0.310 0.020 0.219 0.199 0.234 0.154 0.314 0.260 1.000
Nausea, gas, or indigestion 0.505 0.264 0.351 0.351 0.049 0.234 0.221 0.300 0.120 0.327 0.315 0.588 1.000
Trouble falling or staying asleep, or sleeping too 0.226 0.182 0.206 0.198 −0.040 0.236 0.141 0.224 −0.009 0.256 0.201 0.203 0.229 1.000
Feeling tired or having little energy 0.248 0.248 0.257 0.304 0.024 0.257 0.155 0.325 0.094 0.308 0.277 0.289 0.295 0.525 1.000