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Table 1 Characteristics of all included studies

From: Serum magnesium levels and lung cancer risk: a meta-analysis

Study, year Country Age (range or Mean ± SD) Study type Lung cancer cases Controls Methods of measured magnesium
n Female (%) Magnesium: Mean ± SD n Magnesium: Mean ± SD
Cobanoglu U et al., 2010 Turkey 54 ± 8.29 Case-control 30 33.33 156.21 ± 22.21 μg/L 20 185.8 ± 4.05 μg/L Atomic Absorption Spectrophotometer measurements (UNICAM-929 spectrophotometer)
Diez M et al., 1989 Spain 60 ± 7 Case-control 64 7.81 20.6 ± 3.2 μg/L 100 21.7 ± 8 μg/L Perkin-Elmer 5.000 atomic absorption spectrophotometer
Jin ZJ et al., 2001 China 45–70 Case-control 40 7.50 1300 ± 390 μmol/L 46 1320 ± 310 μmol/L Atomic Absorption Spectrophotometer measurements
Xu ZF et al., 1993 China 56 ± 7.5 Case-control 42 9.52 804.63 ± 71.29 μmol/L 40 936.83 ± 93.31 μmol/L Atomic Absorption Spectrophotometer measurements
He WD et al., 1995 China 34–72 Case-control 143 39.16 940.88 ± 116.95 μmol/L 50 871.24 ± 96.88 μmol/L Atomic Absorption Spectrophotometer measurements
Huang ZY et al., 1998 China 25–65 Case-control 136 19.12 1.8275 ± 0.375 μmol/L 7101 0.8254 ± 0.1778 μmol/L Atomic Absorption Spectrophotometer measurements (Japan Shimadzu-AA670/C2H2)
Wang ZL et al., 2003 China 28–69 Case-control 50 40.00 68.29 ± 35.26 μg/L 60 114.1 ± 52.12 μg/L Atomic Absorption Spectrophotometer measurements and 721 spectrophotometer
Du FL et al., 1996 China 22–73 Case-control 73 31.51 1100 ± 300 μmol/L 63 1100 ± 100 μmol/L Atomic Absorption Spectrophotometer measurements
Guo XH et al., 1994 China 55.1 Case-control 26 26.92 20.88 ± 6.72 μg/mL 26 18.84 ± 5.86 μg/mL Atomic Absorption Spectrophotometer measurements (Varian Spectr AA-40p, USA)
Wang FJ et al., 2014 China 17–77 Case-control 68 44.12 880 ± 60 μmol/L 60 860 ± 90 μmol/L Xylene blue method
Fang JQ et al., 1998 China 55–65 Case-control 35 5.71 1.34 ± 0.35 μmol/L 29 1.36 ± 0.29 μmol/L Atomic Absorption Spectrophotometer measurements