. 2019 Jun 27;9(4):363–371. doi: 10.4103/jispcd.JISPCD_92_19

Table 13.

Logistic regression model: clinical grading stage II oral submucous fibrosis with various parameters

Parameter estimates

Clinical grading^a Stage II		B	Std. error	Wald	df	Sig.	Exp (B)	95% Confidence interval for Exp (B)

								Lower bound	Upper bound
Stage II	Intercept	13.857	2.652	27.312	1	0.000
Gender	Male	1.090	1.712	0.405	1	0.525	2.973	0.104	85.266
Gender	Female	0^b			0
Age group	21–30	−2.379	1.744	1.860	1	0.173	0.093	0.003	2.829
	31–40	−2.239	1.656	1.830	1	0.176	0.107	0.004	2.733
	41–50	−2.877	1.432	4.037	1	0.045	0.056	0.003	0.932
	51–60	−3.688	0.000		1		0.025	0.025	0.025
Habit factor	Paan masala	14.666	4638.751	0.000	1	0.997	2341849.299	0.000	. ^c
	Gutkha	1.136	0.891	1.625	1	0.202	3.113	0.543	17.839
	Paan	1.639	1.068	2.355	1	0.125	5.150	0.635	41.784
	Gudaku	16.626	2425.788	0.000	1	0.995	16619202.587	0.000	. ^c
	Combination	0^b			0
Frequency	1–4 packets	−0.148	1.628	0.008	1	0.928	0.862	0.035	20.956
	5–9 packets	2.621	1.172	5.002	1	0.025	13.752	1.383	136.748
	10–14 packets	2.248	1.176	3.657	1	0.056	9.469	0.945	94.841
	>15 packets	0^b			0
Duration	0–3 years	−10.746	1.640	42.914	1	0.000	2.153E-05	8.643E-07	0.001
	4–6 years	−12.403	1.262	96.656	1	0.000	4.104E-06	3.462E-07	4.866E-05
	7–9 years	−12.820	1.154	123.511	1	0.000	2.706E-06	2.821E-07	2.595E-05
	>10 years	−11.283	0.000		1		1.259E-05	1.259E-05	1.259E-05
Contents	Spit	−0.429	1.423	0.091	1	0.763	0.651	0.040	10.590
Contents	Swallow	0^b			0
Chewing time	0–5 min	−0.180	1.130	0.025	1	0.873	0.835	0.091	7.652
	6–10 min	1.222	0.885	1.908	1	0.167	3.394	0.599	19.214
	11–15 min	0.044	0.914	0.002	1	0.961	1.045	0.174	6.276
	>15 min	0^b			0

^aThe reference category is stage III,

^bFloating point overflow occurred while computing this statistic. Its value is therefore set to system missing, ^cThis parameter is set to zero because it is redundant