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Table 1 Linear regression results

From: Association of COVID-19-imposed lockdown and online searches for toothache in Iran

 

2020

2019

2018

2017

2016

(Constant)

0.69***

(0.33, 1.05)

 − 0.41

(− 1.05, 0.23)

0.05

(− 0.55, 0.65)

0.33

(− 0.29, 0.95)

0.002

(− 0.55, 0.55)

Human Development Index (HDI)

 − 3.29**

(− 5.80,  − 0.78 (

4.30

(− 0.19, 8.78)

1.56

(− 2.65, 5.78)

 − 0.69

(− 5.04, 3.67)

1.83

(− 2.02, 5.69)

Internet access

0.36

(− 0.38, 1.09)

 − 0.59

(− 1.90, 0.72)

 − 0.50

(− 1.73, 0.74)

 − 0.22

(− 1.49, 1.06)

 − 1.13*

(− 2.26, 0.00)

Fluoride concentration

 − 0.13*

(− 0.24,  − 0.03)

 − 0.12

(− 0.31, 0.07)

 − 0.16

(− 0.33, 0.02)

 − 0.09

(− 0.27, 0.09)

0.08

(− 0.08, 0.24)

Dentists’ density

 − 0.04

(− 0.25, 0.17)

 − 0.34

(− 0.72, 0.03)

 − 0.074

(− 0.43, 0.28)

0.14

(− 0.23, 0.50)

 − 0.01

(− 0.33, 0.31)

Daily smokers

0.33**

(0.13, 0.53)

 − 0.07

(− 0.42, 0.29)

 − 0.17

(− 0.50, 0.16)

0.02

(− 0.32, 0.36)

0.20

(− 0.10, 0.50)

R2

0.541

0.274

0.234

0.092

0.320

  1. 95% compatibility intervals in brackets (*p < 0.05; **p < 0.01; ***p < 0.001)