Efficacy, Safety, and Pharmacokinetics of Tirzepatide (LY3298176) Once Weekly Versus Placebo in Pediatric Participants 6 to Less Than 12 Years of Age Who Have Obesity (ADVANCE-SURMOUNT-KIDS)

The main purpose of this study, performed under Master Protocol J4M-MC-PWMP (NCT06672549), is to evaluate the efficacy, safety, and pharmacokinetics of tirzepatide as an addition to healthy lifestyle in participants 6 to less than 12 years of age, with obesity. Participation in the study will last about 104 weeks. Participants who have completed the primary 104-week PW02 study (including the 4-week safety follow-up period), will have the opportunity to receive an additional 156 weeks of treatment with tirzepatide as well as continuing the lifestyle intervention.

Inclusion Criteria: J4M-MC-PW02 * Are 6 to less than 12 years of age (Tanner stage 1 to 5 inclusive) * Have: * a body weight of ≥ 40 kilograms (kg) (88 pounds), and * been diagnosed with obesity, as defined by BMI equal to or above the 95th percentile for age and sex, on age- and sex-specific growth chart J4M-MC-PWMP * Have a history of at least 1 unsuccessful effort to lose sufficient body weight after participation in a structured lifestyle modification program (diet and exercise counseling for at least 3 months) prior to screening. * Obesity as defined by BMI equal to or above the 95th percentile for age and sex (on age- and gender-specific growth chart \[CDC-NCHS, 2022\]) Exclusion Criteria: J4M-MC-PW02 * Have a history of * proliferative diabetic retinopathy * diabetic macular edema, or * nonproliferative diabetic retinopathy that requires acute treatment J4M-MC-PWMP * Have undergone or plan to undergo weight reduction procedure during the study, such as, but not limited to: * gastric bypass * sleeve gastrectomy * restrictive bariatric surgery, such as Lap-Band® gastric banding, or * any other procedure intended to result in weight reduction. * Have a diagnosis that is a secondary cause of obesity or have a history of abrupt onset of obesity suggesting a secondary cause, such as hypothalamic, monogenetic, syndromic, or endocrine causes. * Have type 1 diabetes or history of ketoacidosis, or hyperosmolar state. * Have HbA1c \>9.0% (75 mmol/mol) as measured by central laboratory at screening. * Have a family or personal history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia Syndrome Type 2.