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Table 2 FeNO as surrogate endpoint of an intervention in prevention of OA: grading of the studies

From: The value of fractional exhaled nitric oxide in occupational diseases – a systematic review

Study

Selection bias

Type of study

Confounders

Data collection methods

Blinding

Dropout rate

Grading

Al Badri et al., 2020 [34]

Weak

Longitudinal

Strong

Strong

Moderate

Moderate

Moderate

Dressel et al., 2007 [35]

Moderate

Longitudinal

Moderate

Moderate

Moderate

Strong

Strong

Dressel et al., 2009 [36]

Moderate

Longitudinal

Strong

Strong

Moderate

Weak

Moderate