Table 3. Importance of input variables in LTBI risk prediction model based on SVM algorithm.

Variant	Importance of forecasting	Variant	Importance of forecasting	Variant	Importance of forecasting
Abbreviation: SVM=support vector machines; LTBI=latent tuberculosis infection; BCG=Bacille Calmette–Guérin.
Contact type	0.1476	Etiological results of index case	0.1047	Occupation of index case	0.0509
Key population classification of index case	0.1236	Household registration type	0.0891	BCG scar	0.0281
Residential area of close contact	0.1202	Annual household income	0.0712
Frequency of group activity participation	0.1125	Weekly frequency of sleep deprivation	0.0568