The baseline characteristics of all eligible studies.

Abbreviations: HB = hospital-based design; PB = population-based design; NA = not available; CD = Crohn's disase; UC = ulcerative colitis.

NIAID Data Ecosystem10

Baseline Characteristics of Eligible Studies.

a: age is presented as median and range or mean + standard deviation; b: data was only extracted from the training set; c: percentage not available; d: studies not included in quantitative synthesis.

NIAID Data Ecosystem20

Baseline Characteristics of Eligible Studies.

Age is presented as median and range or mean±standard deviation; † data was extracted from training set.

Figshare2015-12-02 更新00