Table 4 Results of the linear difference model for scenario 2

Number of reviewers during data extraction

2.218 [1.701; 2.893]

< 0.0001

Number of reviewers during screening

1.832 [1.474; 2.278]

< 0.0001

Full-text analysis

1.753 [1.241; 2.476]

0.0015

Types of HTA domains

1.539 [1.267; 1.869]

0.0001

Number of databases

1.223 [0.969; 1.544]

0.0906

Publication period to be considered

0.966 [0.787; 1.186]

0.7435