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Table 2. The characteristics of included studies and NOS score

From: The chest CT features of coronavirus disease 2019 (COVID-19) in China: a meta-analysis of 19 retrospective studies

Author Study type Province Period of study In-patients Asymptomatic CT negative Group Time of symptom onset to CT NOS score
Zhao et al. Retrospective Hunan NA Hospitalised 2 8 Nonemergency Group (mild and common types), Emergency Group (severe and fatal types) Range 0–7 days; median: 1 day 6
Xu et al. Retrospective Guangdong 2020/1/23–2020/2/4 Hospitalised 6 0 NA NA 5
Han et al. Retrospective Hubei 2020/1/4–2020/2/3 Hospitalised 0 0 Mild Range 1–3 days; median: 1 day 4
Yan Li Retrospective Hubei 2020/1/23–2020/1/29 Hospitalised 1 0 NA NA 7
Xiong et al. Retrospective Hubei 2020/1/11–2020/2/5 Hospitalised 0 0 NA Range 1–11 days; mean: 4.5 days 6
Cheng et al. Retrospective Shanghai 2020/1/19–2020/2/6 Hospitalised 0 0 NA NA 7
Xu et al. Retrospective Beijing 2020/1–2020/2 Hospitalised 0 9 Mild, Moderate, severe/critically severe NA 7
Yuan et al. Retrospective Hubei 2020/1/1–2020/1/25 Hospitalised 0 0 Survival group, Mortality group Range 5–11 days; median: 8 days 8
Chung et al. Retrospective Guangdong, Jiangxi, Shangdong 2020/1/18–2020/1/27 Hospitalised 2 3 NA NA 6
Zhang et al. Retrospective Sichuan NA Hospitalised 0 0 NA Range 6 h-11 days; median:4.04 days 4
Pan et al. Retrospective Hubei 2019/12/30–2020/1/31 Hospitalised NA 0 NA NA 5
Shi et al. Retrospective Hubei 2019/12/20–2020/1/23 Hospitalised 0 0 NA Group 1 (subclinical patients; scans done before symptom onset), group 2 (scans done ≤ 1 week after symptom onset), group 3 (> 1–2 weeks), group 4 (> 2–3 weeks) 8
Li et al. Retrospective Chongqing 2020/1–2020/2 Hospitalised 0 8 Ordinary group, severe/critical group NA 6
Bernheim et al. Retrospective Jiangxi, Guangdong, Guangxi, Sichuan 2020/1/18–2020/2/2 Hospitalised 0 24 NA Early phase: ≤ 2 days; intermediate pahse: 3–5 days; late phase:6–12 days 4
Wu et al. Retrospective Hubei 2020/1–2020/2 Hospitalised 0 14 NA 7 ± 4 days 4
Guan et al. Retrospective Beijing 2020/1/12–2020/2/28 Hospitalised NA 6 NA NA 6
Bai et al. Retrospective Hunan 2020/1/6–2020/2/20 Hospitalised NA 37 NA NA 6
Song et al. Retrospective Shanghai 2020/1/20–2020/1/27 Hospitalised 0 3 NA Interval from disease onset to CT ≤ 4 Days; interval from disease onset to CT > 4 days 7
Miao et al. Retrospective Shanghai, Jiangxi 2020/1/12–2020/2/13 Hospitalised 0 28 NA Less than 14 days 7
  1. NA: not available