An Adverse event (AE) was defined as any untoward medical occurrence in a clinical investigation participant whose parent or legal guardian had signed informed consent form to participate in a study; it did not necessarily have to have a causal relationship with this treatment or study participation. An AE could therefore be any unfavorable and unintended sign (example, a clinically significant abnormal laboratory finding), symptom, or disease temporally associated with the study participation whether or not it was considered related to the drug or study procedures. A TEAE was defined as any AE occurring after the start of TAK-536 administration, and until the end of follow-up period of 2 weeks.

The relatedness of TEAEs with resting 12-lead ECG was based upon investigator discretion.

The anthropometric measurements included weight, height and body mass index (BMI). The relatedness of TEAEs to anthropometric measurements was based upon investigator discretion.

The laboratory values outside the range (triglycerides greater than \[\>\] 2.5\*upper limit of normal \[ULN\], blood urea nitrogen \[BUN\] \>30 milligram per deciliter \[mg/dL\], estimated glomerular filtration rate \[eGFR\] less than \[\<\] 30 milliliter per minute per 1.73 square meter \[mL/min/1.73m\^2\], and glucose \<50 mg/dL were considered markedly abnormal for TEAEs. The relatedness of TEAEs to clinical laboratory parameters was based upon investigator discretion.

Vital signs included home sitting blood pressure (diastolic and systolic) and office sitting pulse rate (pulse rate per 1 minute). The pulse rate measured at the last measurement of the sitting blood pressure was used as the sitting pulse rate value. The relatedness of TEAEs to vital signs was based upon investigator discretion.