Participants who were prescribed Humira per approved prescribing information of Humira in Japan.

An AE is any untoward medical occurrence, which does not necessarily have a causal relationship with treatment. An Adverse Drug Reaction (ADR) is any noxious and undesired reaction related to an experimental drug or experiment. A serious AE (SAE) is an AE that results in death, is life-threatening, results in or prolongs hospitalization, results in congenital anomaly, persistent or significant disability/incapacity, spontaneous or elective abortion, or requires intervention to prevent a serious outcome. AEs were rated for severity as either Mild: transient and easily tolerated; Moderate: causes discomfort and interrupts usual activities; or Severe: causes considerable interference with usual activities, may be incapacitating or life-threatening. AEs related to adalimumab were assessed as being either probably or possibly related by the investigator. An Unexpected ADR is an ADR for which the nature or gravity is not consistent with the applicable product information.

The CDAI is used to evaluate the activity of Crohn's disease. The CDAI is calculated on the basis of a one-week evaluation of 8 items and ranges from 0 to about 600. The 8 items are frequency of liquid or very soft stool, abdominal pain, complications of Crohn's disease (e.g., uveitis, arthritis, fistula, and abscess), abdominal mass, hematocrit, body weight, use of antidiarrheals, and general condition. Low scores indicate low activity of Crohn's disease. In general, CDAI scores below 150 represent remission and scores over 450 represent very severe Crohn's disease.

The CDAI is used to evaluate the activity of Crohn's disease. The CDAI is calculated on the basis of a one-week evaluation of 8 items and ranges from 0 to about 600. The 8 items are frequency of liquid or very soft stool, abdominal pain, complications of Crohn's disease (e.g., uveitis, arthritis, fistula, and abscess), abdominal mass, hematocrit, body weight, use of antidiarrheals, and general condition. Low scores indicate low activity of Crohn's disease. In general, CDAI scores below 150 represent remission and scores over 450 represent very severe Crohn's disease.

Overall response rating, according to investigator's subjective clinical opinion. The level of improvement (markedly improved, improved, not improved, or not assessable) was categorized by comparing clinical condition at week 24 or at discontinuation with baseline condition.