Table 4.

Determinants of qualitative serology response – Results of meta-analysis

Characteristics*	N (%) with serologic response	OR (95% CI)
Sex [Bo, Bs, V]
Men	5037 (99.2%)	1 (Ref)
Women	12092 (99.4%)	1.49 (0.97-2.30)
Age [Bo, Bs, V]
10-yr increase	-	0.46 (0.27-0.79)
Job Title [Bo, Bs, V]
Administration	1343 (98.7%)	1 (Ref)
Physician	5015 (99.4%)	1.61 (0.84-3.10)
Nurse	5875 (99.4%)	1.40 (0.75-2.60)
Technician	1268 (99.4%)	1.83 (0.80-4.18)
Other HCW	3628 (99.4%)	1.16 (0.60-2.24)
Previous COVID-19 infection [Bo, Bs, V]
No	14647 (99.2%)	-†
Yes	2482 (100%)	-†
Time since vaccination [Bo, Bs]
14-day interval	-	0.69 (0.42-1.13)
Pre-vaccination serology level [Bs, V]
1 SD increase	-	1.10 (0.86-1.40)

* Centers included in the analysis are indicated in square brackets: Bo, Bologna, Bs, Brescia, V, Verona; † Model did not converge; CI, confidence interval; OR, meta-analytic odds ratio, adjusted for sex, age, job title and previous infection, as appropriate; Ref, reference category