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Table 2 Type of fuels used by study participants

From: Indoor solid fuel use and tuberculosis in China: a matched case-control study

  Case Control
Total 202 (100%) 404 (100%)
No food cooked at home 2 (1.0%) 2 (0.5%)
Electricity 8 (4.0%) 11 (2.7%)
Liquefied petroleum gas 38 (18.8%) 87 (21.5%)
Natural gas/Biogas 4 (2.0%) 9 (2.2%)
Kerosene 0 0
Coal / lignite 16 (7.9%) 22 (5.5%)
Charcoal 3 (1.5%) 1(0.3%)
Wood 12 (5.9%) 33 (8.2%)
Straw / shrubs / grass 77 (38.1%) 144 (35.6%)
Animal dung 0 0
Agricultural crop residue 41(20.3%) 93 (23.0%)
Unknown 1(0.5%) 2(0.5%)