Table 2. Characteristics of included systematic reviews/meta-analyses.
| Items | n(%) | 95%CI | |
| Language of publications | Chinese | 235(75.3) | (70.2–79.8) |
| English | 77(24.7) | (20.2–29.8) | |
| Category of journals | CSCD | 134(57.0) | (50.6–63.2) |
| Non-CSCD | 101(43.0) | (36.8–49.4) | |
| SCI | 74(23.7) | (19.3–28.8) | |
| Non-SCI | 238(76.3) | (71.2–80.7) | |
| Number of authors | ≤2 | 37(11.9) | (8.7–15.9) |
| ≥3 | 275(88.1) | (84.1–91.3) | |
| Affiliations | University | 105(33.7) | (28.6–39.1) |
| Hospital | 207(66.3) | (60.9–71.4) | |
| Number of affiliations | 1 | 162(51.9) | (46.4–57.4) |
| ≥2 | 150(48.1) | (42.6–53.6) | |
| Foundation item | Government | 90(28.8) | (24.1–34.1) |
| Unreported | 222(71.2) | (65.9–75.9) | |
| Index test | Imaging technologies | 141(45.2) | (39.8–50.8) |
| Laboratory technologies | 159(51.0) | (45.4–56.5) | |
| Pathological technologies | 2(0.6) | (0.2–2.5) | |
| Others | 10(3.2) | (1.7–5.9) | |
| Number of included RCT | 1–5 | 21(6.7) | (4.4–10.1) |
| 6–10 | 88(28.2) | (23.5–33.5) | |
| 11–15 | 80(25.6) | (21.1–30.8) | |
| 16–20 | 43(13.8) | (14–18.1) | |
| ≥21 | 78(25.0) | (20.5–30.1) | |
| Unreported | 2(0.6) | (0.2–2.5) | |
| Categories of disease | Neoplasms | 132(42.3) | (36.9–47.9) |
| Diseases of the digestive system | 32(10.3) | (7.3–14.1) | |
| Diseases of the respiratory system | 24(7.7) | (5.2–11.2) | |
| Diseases of the circulatory system | 26(8.3) | (5.7–12.0) | |
| Certain infectious and parasitic diseases | 32(10.3) | (7.3–14.1) | |
| Diseases of the blood and blood -forming organs | 8(2.6) | (1.3–5.0) | |
| Endocrine,nutritional and metabolic diseases | 9(2.9) | (1.5–5.4) | |
| Diseases of the musculoskeletal system and connective tissue | 17(5.4) | (3.4–8.6) | |
| Diseases of the eye and adnexa | 2(0.6) | (0.2–2.5) | |
| Diseases of the genitourinary system | 10(3.2) | (1.7–5.9) | |
| Pregnancy, childbirth and the puerperium | 3(1.0) | (0.3–2.9) | |
| Congenital malformations, deformations andchromosomal abnormalities | 7(2.2) | (1.1–4.6) | |
| Symptoms, signs and abnormal clinical and laboratory findings,not elsewhere classified | 2(0.6) | (0.2–2.5) | |
| Injury, poisoning and certain other consequences of external causes | 5(1.6) | (0.7–3.8) | |
| Certain conditions originating in the perinatal period | 3(1.0) | (0.3–2.9) |
(Notes: RCT: Randomized Controlled Trials; CSCD: Chinese Science Citation Database; SCI: Science Citation Index).