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Participants who subsequently developed independent review committee (IRC)-confirmed progressive disease (PD) and had active disease requiring treatment were eligible to participate in the Subsequent Therapy Phase and received single-agent ibrutinib until disease progression or unacceptable toxicity.","id":"BG000","title":"Treatment Arm A (Ibrutinib + Venetoclax)"},{"description":"Participants received chlorambucil 0.5 milligrams per kilogram (mg/kg) body weight orally once daily on Days 1 and 15 of Cycles 1 to 6 in combination with obinutuzumab 1000 mgs intravenously (IV) once daily on Days 1, 8, and 15 of Cycle 1 and Day 1 of Cycles 2 to 6 (each cycle is of 28 days). Participants who subsequently developed IRC-confirmed progressive disease (PD) and had active disease requiring treatment were eligible to participate in the Subsequent Therapy Phase and received single-agent ibrutinib until disease progression or unacceptable toxicity.","id":"BG001","title":"Treatment Arm B (Chlorambucil + Obinutuzumab)"},{"description":"Total of all reporting groups","id":"BG002","title":"Total"}],"measures":[{"classes":[{"categories":[{"measurements":[{"groupId":"BG000","spread":"8.02","value":"71"},{"groupId":"BG001","spread":"6.16","value":"72"},{"groupId":"BG002","spread":"7.01","value":"71.5"}]}]}],"dispersionType":"STANDARD_DEVIATION","paramType":"MEAN","title":"Age, 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