Table 5:

Multivariate effect of specific variables on (α) the final number of parathyroid glands seen, (β) number of frozen sections sent during parathyroidectomy and (Ω) the operative time of parathyroidectomy

	Odds Ratio	Confidence Interval (2.5% – 97.5%)	p-value
Impact on Number of Parathyroid Glands Seen ^α
Use of probe-based NIRAF	4.25	2.12–8.52	<0.001^*
Senior surgeon	1.75	0.80–3.82	0.15
Bilateral exploration	70.13	20.29–242.43	<0.001^*
Re-operative surgery	0.28	0.03–2.37	0.24
Localized	0.65	0.29–1.46	0.30
Final diagnosis	3.67	0.48–27.62	0.20
Age	0.94	0.97–1.01	0.62
Sex	1.55	0.69–3.48	0.28
BMI	1.00	0.96–1.05	0.78
Impact on Number of Frozen Sections Sent ^β
	Odds Ratio	Confidence Interval (2.5% – 97.5%)	p-value
Use of probe-based NIRAF	0.38	0.17 – 0.87	0.02^*
Senior surgeon	0.34	0.14 – 0.81	0.01^*
Bilateral exploration	3.41	1.06 – 11.04	0.04^*
Re-operative surgery	1.69	0.12 – 24.31	0.67
Localized	0.44	0.18 – 1.09	0.08
Final diagnosis	0.25	0.02 – 3.03	0.28
Age	1.00	0.97 – 1.03	0.81
Sex	2.21	0.76 – 6.45	0.15
BMI	1.01	0.96 – 1.06	0.58
Impact on Operative Time ^Ω
	Estimate	Std. Error	p-value
Use of probe-based NIRAF	−3.04	5.46	0.58
Senior surgeon	−23.27	6.41	<0.001^*
Bilateral exploration	28.84	7.87	<0.001^*
Re-operative surgery	11.10	19.30	0.57
Localized	−7.36	6.57	0.26
Final diagnosis	−14.68	18.23	0.42
Age	−0.03	0.20	0.88
Sex	−3.12	6.75	0.64
BMI	0.24	0.38	0.53

^{α –}

The effects of these study design variables were analyzed with ordinal logistic regression.

p-value < 0.05 suggests that particular variable has a significant effect on the final number of parathyroid glands seen with high confidence during parathyroidectomy.

^{β –}

The effects of these study design variables were analyzed with ordinal logistic regression.

p-value < 0.05 suggests that a particular variable has a significant effect on the number of frozen sections sent during parathyroidectomy.

^{Ω –}

The effects of these study design variables were analyzed using linear regression.

p-value < 0.05 suggests that a particular variable has a significant effect on the operative time for parathyroidectomy. NIRAF, near infrared autofluorescence; BMI, body mass index