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Table 1 General characteristics of the included studies

From: Effectiveness of low dose thyroxine in patients with subclinical hypothyroidism and migraine; systematic review and meta-analysis

Study ID

Country of Study

Type of Study

Sample Size

Duration

of Follow-Up

Quality assessment

Dev, 2023 [22]

India

A randomized controlled trial

87

3 months

Some concern

Filipchuk, 2022 [31]

Argentina

Case control

137

6 months

Satisfactory quality

Hepp, 2018 [32]*

USA

Matched cohort

318,628

1 year

Good quality

Lage, 2020 [33]*

USA

Retrospective cohort

3448

NA

Satisfactory quality

  1. * Included in the meta-analysis