Table 2.
Factor loadings for one-, two-, and three-factor solutions (N = 424)
| Factor Loadings One-factor model |
Two-factor model | Three-factor model | |||||
|---|---|---|---|---|---|---|---|
| Item | Item description | Factor 1 | Factor 1: “Pelvic Pain” |
Factor 2: “Urinary Symptoms” |
Factor 1 | Factor 2 | Factor 3 |
| GUPI 1 | Number of pelvic areas checked (0–4) | 0.39 | 0.63 | −0.12 | 0.78 | −0.33 | 0.01 |
| GUPI 2a | Pain or burning during urination (Yes/No) | 0.45 | 0.37 | 0.18 | 0.45 | −0.01 | 0.18 |
| GUPI 2b | Pain or discomfort during or after sexual climax (Yes/No) | 0.31 | 0.54 | −0.12 | 0.68 | −0.35 | 0.09 |
| GUPI 2c | Pain or discomfort during bladder filling (Yes/No) | 0.67 | 0.33 | 0.47 | 0.32 | 0.35 | 0.22 |
| GUPI 2d | Pain or discomfort relieved by voiding (Yes/No) | 0.45 | 0.23 | 0.30 | 0.24 | 0.16 | 0.24 |
| GUPI 3 | How often have you had pain or discomfort…? (0–5) | 0.58 | 0.70 | 0.02 | 0.83 | −0.06 | −0.27 |
| GUPI 4 | Which number best described your AVERAGE pain or discomfort…? (0–10) | 0.60 | 0.57 | 0.18 | 0.66 | 0.12 | −0.18 |
| GUPI 5 | How often have you had a sensation of not emptying your bladder…? (0–5) | 0.60 | 0.22 | 0.48 | 0.23 | 0.45 | 0.02 |
| GUPI 6 | How often have you had to urinate again less than two hours after you finished urinating…? (0–5) | 0.92 | 0.01 | 0.93 | 0.01 | 1.01 | −0.28 |
| GUPI 7 | How much have your symptoms kept you from doing the kinds of things you would usually do…? (0–3) | 0.59 | 0.67 | 0.07 | 0.78 | 0.02 | −0.27 |
| GUPI 8 | How much do you think about your symptoms…? (0–3) | 0.68 | 0.83 | −0.01 | 0.94 | 0.01 | −0.51 |
| GUPI 9 | If you were to spend the rest of life with your symptoms…? (0–6) | 0.63 | 0.79 | −0.02 | 0.89 | −0.02 | −0.43 |
| ICPI 1 | Frequent urination during the day (0–4) | 0.82 | 0.09 | 0.79 | 0.05 | 0.83 | −0.01 |
| ICPI 2 | Getting up at night to urinate (0–4) | 0.77 | −0.17 | 0.91 | −0.29 | 1.03 | 0.02 |
| ICPI 3 | Need to urinate with little warning (0–4) | 0.83 | 0.00 | 0.86 | 0.00 | 0.58 | 0.53 |
| ICPI 4 | Bladder pain, discomfort, pressure, burning (0–4) | 0.82 | 0.65 | 0.35 | 0.69 | 0.11 | 0.27 |
| ICSI 1 | Strong need to urinate (0–5) | 0.81 | 0.01 | 0.84 | 0.02 | 0.58 | 0.47 |
| ICSI 2 | Frequent urination during the day (0–5) | 0.94 | 0.00 | 0.95 | −0.01 | 1.02 | −0.25 |
| ICSI 3 | Getting up at night to urinate (0–5) | 0.63 | −0.23 | 0.82 | −0.35 | 0.95 | 0.00 |
| ICSI 4 | Bladder pain or burning (0–5) | 0.75 | 0.65 | 0.26 | 0.69 | 0.01 | 0.26 |
Note. GUPI = Genitourinary Pain Index, ICSI = Interstitial Cystitis Symptom Index, ICPI = Interstitial Cystitis Problem Index. Higher factor loadings indicate stronger relationships between items and factors; Factor loadings ≥ .4 are in bold. Principal components analysis as well as parallel analysis suggested a two-factor solution, so we named those two factors. The one- and three-factor solutions are presented for reference and comparison.