Table 3 The Classification of Articles by Number of Subjects

Number of Subjects	Frequency (%)
<10	36 (50.0%)
10≤ <20	3 (4.1%)
20≤ <30	3 (4.1%)
30≤ <40	0 (0.0%)
40≤ <50	3 (4.1%)
50≤ <100	5 (6.9%)
100≤	22 (30.5%)
Total	72 (100.0%)