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 |