A Study of Lebrikizumab in Adolescent Participants With Uncontrolled Asthma Who Are on Inhaled Corticosteroids and a Second Controller Medication

Inclusion Criteria: * Asthma diagnosis for greater than or equal to (\>/=) 12 months prior to Visit 1 * Bronchodilator response during screening * Pre-bronchodilator FEV1 of 40 percent (%) - 90% predicted at both Visits 2 and 3 * On high dose ICS therapy for \>/= 6 months prior to Visit 1 * On an eligible second controller medication for 6 months prior to Visit 1 * Uncontrolled asthma as defined by the protocol both during screening and at the time of randomization * Demonstrated adherence with controller medication during the screening period Exclusion Criteria: * History of severe allergic reaction or anaphylactic reaction to a biologic agent or known hypersensitivity to any component of the lebrikizumab injection * Maintenance oral corticosteroid therapy within 3 months prior to Visit 1 * Treatment with systemic (oral, intravenous \[IV\], or intramuscular \[IM\]) corticosteroids within 4 weeks prior to Visit 1 or during the screening period * Treatment with intra-articular corticosteroids within 4 weeks prior to Visit 1 or during the screening period or anticipated need for intra-articular corticosteroids during the course of the study * Infection that meets the following criteria: Any infection requiring hospital admission or requiring treatment with IV or IM antibiotics within 4 weeks prior to Visit 1 or during screening; any active infection that required treatment with oral antibiotics within 2 weeks prior to Visit 1 or during screening; upper or lower respiratory t…