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Table 12 Description of the Pfizer vaccination centers during the vaccine preparation process*

From: Vaccination process evaluation at COVID-19 vaccination centers in Lebanon: a national study

Questions

PZ N = 20 (%)

1. Vials are held at room temperature for up to 2 h before mixing

 No

1 (5.0)

 Yes

15 (75.0)

 Not observed

4 (20.0)

2. Diluent used (specify type and amount used: 1.8 mL of 0.9% sodium chloride)

 Yes

16 (80.0)

 Not observed

4 (20.0)

3. Top of the 0.9% sodium chloride vial cleaned with a single-use alcohol swab

 No

3 (15.0)

 Yes

13 (65.0)

 Not observed

4 (20.0)

4. Needle 21 gauge or narrower recommended for dilution process

 Yes

16 (80.0)

 Not observed

4 (20.0)

5. Top of the vaccine of vial cleaned with single-use alcohol swab prior to piercing it

 No

6 (30.0)

 Yes

10 (50.0)

 Not observed

4 (20.0)

6. 1.8 mL of diluent added into the vaccine vial

 No

1 (5.0)

 Yes

15 (75.0)

 Not observed

4 (20.0)

7. Before removing the needle from the vaccine vial, pressure in the vial equalized by withdrawing 1.8 mL of air into the empty diluent syringe

 No

1 (5.0)

 Yes

15 (75.0)

 Not observed

4 (20.0)

8. Vaccine vial gently inverted 10 times before and after dilution

 No

6 (30.0)

 Yes

10 (50.0)

 Not observed

4 (20.0)

9. Draw up 0.3 mL of the diluted solution into a new sterile syringe with a needle appropriate for intramuscular injection

 No

2 (10.0)

 Yes

14 (70.0)

 Not observed

4 (20.0)

10. Significant air bubbles are removed from the syringe while the needle is still in the vial of the reconstituted vaccine

 No

4 (20.0)

 Yes

12 (60.0)

 Not observed

4 (20.0)

11. Mixed vaccine kept between + 2 °C and + 25 °C and used within 6 h

 No

1 (5.0)

 Yes

15 (75.0)

 Not observed

4 (20.0)

  1. *Statistical tests used included Pearson’s Chi-squared test or Fisher’s exact test