Severe COVID-19 in China: Clinical Signs and Risk Factors

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Severe COVID-19 in China: Clinical Signs and Risk Factors Linked to Worse Outcomes

By early 2020, COVID-19 had swept across China, leaving clinicians racing to understand why some patients developed life-threatening illness while others recovered easily. A 2021 study from leading Chinese hospitals shed light on this question—identifying who’s most at risk for severe COVID-19 and what signs to watch for.

Researchers from Peking University People’s Hospital and 8 other institutions analyzed data from 289 hospitalized COVID-19 patients across 12 Chinese provinces. Their goal? To pinpoint the clinical features and risk factors that predict severe disease—information critical for early intervention and saving lives.

Who’s Most at Risk for Severe COVID-19?

The study uncovered five key risk factors for severe disease:

  1. Age 65 or older: Older adults were 2.7 times more likely to have severe COVID-19 than younger patients. Weakened immune systems in older adults may prolong inflammation and raise the risk of complications.
  2. Male gender: Men were 1.9 times more likely to develop severe disease than women. This aligns with global research suggesting sex hormones (like estrogen) and the X chromosome may protect women from viral infections.
  3. Diabetes: Patients with diabetes were 3.3 times more likely to have severe COVID-19. Diabetes weakens the immune system, making it harder to fight the virus.
  4. Male + diabetes: The combination was especially dangerous: 71% of male patients with diabetes ended up in the severe group, compared to 29% of women with diabetes.
  5. Exposure to confirmed cases: Surprisingly, patients who had contact with confirmed COVID-19 cases were less likely to have severe disease—possibly because they sought care earlier.

Common Symptoms: What to Watch For

Fever (67% of patients) and cough (59%) were the most common symptoms—no surprise to anyone who followed early COVID-19 news. But severe patients had distinct red flags:

  • Cough: 77% of severe patients had a cough, versus just 50% of non-severe patients.
  • Diarrhea: 20% of severe patients had diarrhea, compared to 10% of non-severe.
  • Shortness of breath: 24% of severe patients struggled to breathe, versus 10% of non-severe.
  • Fast breathing: Severe patients were 21 times more likely to have a respiratory rate over 24 breaths per minute (a sign of low oxygen).

Lab Tests That Signal Trouble

Doctors use lab results to track how the virus affects the body. For severe COVID-19, these tests mattered most:

  • Lymphopenia: Low lymphocyte counts (a type of immune cell) were 2x more common in severe patients. This suggests the virus was attacking the immune system directly.
  • High procalcitonin: 41% of severe patients had elevated procalcitonin (a marker for bacterial infection), versus 10% of non-severe. This signals a higher risk of secondary infections.
  • High C-reactive protein (CRP): 71% of severe patients had elevated CRP (a marker for inflammation), compared to 49% of non-severe. More inflammation means more organ damage.

Treatments and Outcomes

Nearly all patients (96%) received antiviral drugs, and 62% got antibiotics (more common in non-severe cases, where bacterial co-infections were less likely). Severe patients needed more intense care:

  • Noninvasive ventilation: 70% of severe patients used a face mask to help them breathe.
  • Invasive ventilation: 7% needed a breathing tube.
  • ECMO: 2% used a heart-lung machine (a last resort for severe respiratory failure).

Outcomes were stark:

  • 76% of non-severe patients were discharged alive.
  • Only 60% of severe patients were discharged—and 7% died.

What This Means for You

This study reinforces simple, life-saving takeaways:

  • If you’re high-risk: Older adults, men, and people with diabetes should take extra precautions (vaccination, masking, social distancing) to avoid COVID-19.
  • Watch for red flags: If you have COVID-19 and develop a cough, diarrhea, or shortness of breath, seek care immediately. These symptoms signal your body is struggling.
  • For doctors: Monitor high-risk patients closely. Early intervention (like oxygen therapy or antiviral drugs) can prevent severe disease.

The Big Picture

This research is a critical piece of the COVID-19 puzzle—showing how age, gender, and chronic conditions interact to worsen outcomes. While the study focused on Chinese patients, its findings apply globally: Severe COVID-19 isn’t random—it’s predictable. And predictability means we can act faster to save lives.

Jiang N, Liu YN, Bao J, et al. Clinical features and risk factors associated with severe COVID-19 patients in China. Chinese Medical Journal. 2021;134(8):944-953. doi:10.1097/CM9.0000000000001466

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