The primary outcomes and secondary outcomes?

0 In the context below, does "primary outcomes" refer to "primary adverse pregnancy outcomes"? 02br
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00 Why is there "secondary outcomes" since it is just an experiment to "undergo 75-g oral glucose-tolerance testing at 24 to 32 weeks of gestation"? I think that it may be only one "outcomes" . It is "adverse pregnancy outcomes"! 02br
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00Context: 02br
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00 Hyperglycemia and Adverse Pregnancy Outcomes02br
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00The HAPO Study Cooperative Research Group 02br
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00 ABSTRACT02br
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00Background It is controversial whether maternal hyperglycemia less severe than that in02br
00 diabetes mellitus is associated with increased risks of adverse pregnancy outcomes. 02br
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00 Methods A total of 25,505 pregnant women at 15 centers in nine countries underwent 75-g oral glucose-tolerance testing at 24 to 32 weeks of gestation. 02br
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00Data remained blinded if the fasting plasma glucose level was 105 mg per deciliter (5.8 02br
00mmol per liter) or less and the 2-hour plasma glucose level was 200 mg per deciliter (11.1 mmol per liter) or less.02br
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01b00 Primary outcomes02b00 were birth weight above the 90th percentile for gestational age, primary cesarean delivery, clinically diagnosed neonatal hypoglycemia, and cord-blood serum C-peptide level above the 90th percentile. 01b00Secondary outcomes02b00 were delivery before 37 weeks of gestation, shoulder dystocia or birth injury, need for intensive neonatal care, hyperbilirubinemia, and preeclampsia. 02br
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00Full context: 02br
01a05000 02a0230hrefhttp://content.nejm.org/cgi/content/short/358/19/1991