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Table 6 Confirmatory factor analysis of IPAQ: factor loading for ease of use for new disposable pen (N = 134)

From: Psychometric Assessment of the Injection Pen Assessment Questionnaire (IPAQ): measuring ease of use and preference with injection pens for human growth hormone

FIRST ORDER (IPAQ Items)

IPAQ Ease of Use Scales (standardized coefficient)

Preparing the pen

Setting dose

Injecting the medicine

Maintaining the pen

Total IPAQ

2a. Attaching and removing the needle

0.68

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2b. Preparing the injection pen by changing the cartridge or getting a new injection pen

0.82

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2c. Mixing the medicine

0.77

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---

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2d. Removing the air bubbles

0.72

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2e. Remembering the dose that was prescribed by the doctor

---

0.79

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2f. Setting the dose

---

0.77

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2g. Changing the dose when the doctor changes the prescription

---

0.59

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2h. Using the needle guard

---

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0.88

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2i. Injecting the medicine

---

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0.88

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2j. Knowing when the injection pen has finished injecting the medicine

---

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0.70

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2k. Handling the injection pen while preparing and injecting the medicine

---

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0.80

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2l. Storing the injection pen in the refrigerator

---

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---

0.69

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2m. Disposing of the cartridge or disposing of the injection pen

---

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---

0.96

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SECOND ORDER (IPAQ Scales)

---

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Preparing the pen

---

---

---

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0.87

Setting the dose

---

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0.97

Injecting the medicine

---

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0.86

Maintaining the pen

---

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0.63

  1. Item 1 is a single item subscale and is not included in the analysis.
  2. CFI = 0.984.
  3. Root Mean Square Error of Approximation (RMSEA) = 0.051.