From: Association between serum zinc levels and lung cancer: a meta-analysis of observational studies
Study, year | Country | Study type | Age | Lung cancer cases | Controls | Methods of measured zinc | ||
---|---|---|---|---|---|---|---|---|
n | Zinc: mean ± SD | n | Zinc: mean ± SD | |||||
Sun et al., 1991 | China | Case-control | 30–75 | 104 | M = 0.945 ± 0.303(μg/mL) F = 0.970 ± 0.229 (μg/mL) | 252 | M = 0.945 ± 0.23(μg/mL) F = 1.08 ± 0.197 (μg/mL) | Atomic absorption spectrophotometer measurements (IL-951, USA) |
Cobanoglu et al., 2010 | Turkey | Case-control | 54 ± 8.29 | 30 | 0.539 ± 0.225 (μg/dL) | 20 | 2.051 ± 0.298 (μg/dL) | UNICAM-929 spectrophotometer (Unicam Ltd, York Street, Cambridge, UK) |
Diez et al., 1989 | Spain | Case-control | 60 ± 7 | 64 | 0.627 ± 0.136 (μg/mL) | 100 | 0.733 ± 0.173 (μg/mL) | Perkin-Elmer 5.000 atomic absorption spectrophotometer |
Jin et al., 2011 | China | Case-control | 34.9 ± 21.3 | 154 | 0.673 ± 0.47 (μg/mL) | 154 | 1.27 ± 0.442 (μg/mL) | Atomic absorption spectrophotometer (Wako Pure Chemical Industries, Osaka, Japan) |
Oyama et al., 1994 | Japan | Case-control | 26–83 | 109 | 0.853 ± 0.279 (μg/mL) | 53 | 0.873 ± 0.324 (μg/mL) | Atomic absorption spectrophotometry (Wako Pure Chemical Industries, Osaka, Japan) |
Zablocka-Slowinska et al., 2018 | Poland | Case-control | 50–70 | 44 | 0.86 ± 0.215 (μg/L) | 44 | 0.99 ± 0.263 (μg/L) | Atomic absorption spectrometry |
Zowczak et al., 2001 | Poland | Case-control | 42–87 | 14 | 12 ± 2 (μmol/L) | 18 | 13.8 ± 2 (μmol/L) | Flame atomic absorption spectrometry using Perkin ELmer spectrometer |
Feng et al., 2006 | China | Observation study | 18–82 | 13 | 17.72 ± 2.55 (μmol/L) | 36 | 17.57 ± 2.74 (μmol/L) | Flame atomic absorption spectrometry |
Zhang et al., 1997 | China | Case-control | 25–80 | 64 | 0.788 ± 0.171 (μg/mL) | 31 | 0.91 ± 0.374 (μg/mL) | Atomic absorption spectrophotometer measurements |
Jin et al., 2001 | China | Case-control | 45–70 | 40 | 11.1 ± 3.73 (μmol/L) | 46 | 13.4 ± 2.5 (μmol/L) | Atomic absorption spectrophotometer measurements |
Zhang et al., 1994 | China | Case-control | 59 ± 9 | 40 | 16.98 ± 3.06 (μmol/L) | 24 | 20.96 ± 3.67 (μmol/L) | Atomic absorption spectrophotometer measurements |
Xu et al., 1993 | China | Case-control | 56 ± 7.5 | 42 | 11.45 ± 2.08 (μmol/L) | 40 | 13.78 ± 2.12 (μmol/L) | Atomic absorption spectrophotometer measurements |
Zhou et al., 1995 | China | Case-control | 39–69 | 186 | 0.702 ± 0.182 (μg/mL) | 150 | 0.976 ± 0.102 (μg/mL) | Atomic absorption spectrophotometer measurements |
Chen et al., 1994 | China | Case-control | 37–72 | 58 | 27.4 ± 4.8 (mol/L) | 100 | 14.5 ± 3.8 (mol/L) | Atomic absorption spectrophotometer measurements (MFX-ID) |
Luo et al., 1996 | China | Case-control | 40–70 | 35 | 10.25 ± 1.38 (μmol/L) | 22 | 12.85 ± 4.28 (μmol/L) | Atomic Absorption Spectrophotometer measurements |
Mo et al., 1995 | China | Case-control | 58.5 | 57 | 0.719 ± 0.159 (μg/mL) | 46 | 0.955 ± 0.139 (μg/mL) | Atomic absorption spectrophotometer measurements |
He et al., 1995 | China | Case-control | 34–72 | 143 | 19.481 ± 3.671(μmol/L) | 50 | 21.436 ± 6.278(μmol/L) | Atomic absorption spectrophotometer measurements |
Wei L et al., 2002 | China | Case-control | 22–76 | 79 | 0.832 ± 0.092 (μg/mL) | 32 | 1.182 ± 0.018 (μg/mL) | Atomic absorption spectrophotometer measurements (American p-100) |
Zhao et al., 1993 | China | Case-control | 43–62 | 46 | 11.17 ± 3.74 (μmol/L) | 50 | 16.92 ± 5.6 (μmol/L) | Atomic absorption spectrophotometer measurements (BJKP-36) |
He et al., 2011 | China | Case-control | 38–69 | 104 | 9.08 ± 1.44 (μmol/L) | 122 | 16.44 ± 1.69 (μmol/L) | Atomic absorption spectrophotometer measurements |
Chen et al., 1998 | China | Case-control | 47–72 | 43 | 11.74 ± 2.74 (μmol/L) | 180 | 13 ± 1.83 (μmol/L) | Atomic absorption spectrophotometer measurements (Japan Shimadzu-A670) |
Liang et al., 1992 | China | Case-control | 61 | 57 | 13.86 ± 5.56 (μmol/L) | 80 | 21.81 ± 3.38 (μmol/L) | Atomic absorption spectrophotometer measurements (Chinese WFX-ID) |
Huang et al., 1998 | China | Case-control | 25–65 | 136 | 11.933 ± 2.68 (μmol/L) | 7101 | 19.808 ± 6.43(μmol/L) | Atomic absorption spectrophotometer measurements (Japan Shimadzu-AA670/C2H2) |
Wang et al., 2003 | China | Case-control | 28–69 | 50 | 0.74 ± 0.18 (μg/L) | 60 | 1.83 ± 1.44 (μg/L) | Atomic absorption spectrophotometer measurements |
Cheng et al., 2011 | China | Case-control | 37–68 | 197 | 0.9 ± 0.3 (μmol/L) | 93 | 1.12 ± 0.56 (μmol/L) | Atomic absorption spectrophotometer measurements |
Xie et al., 2000 | China | Case-control | 35–68 | 64 | 70.28 ± 10.6 (μmol/L) | 100 | 80.3 ± 20.7 (μmol/L) | Atomic absorption spectrophotometer measurements |
Du et al., 1996 | China | Case-control | 22–73 | 73 | 13.1 ± 4 (μmol/L) | 63 | 15.2 ± 3.5 (μmol/L) | Atomic absorption spectrophotometer measurements |
Zhu et al., 1997 | China | Case-control | NA | 56 | 13.16 ± 1.71 (μmol/L) | 118 | 15.46 ± 2.13 (μmol/L) | Atomic absorption spectrophotometer measurements (Perkin Elmer Zeeman/3030, USA) |
Zhang et al., 2000 | China | Case-control | 25–77 | 310 | 0.812 ± 0.16 (μg/mL) | 48 | 1.039 ± 0.154 (μg/mL) | Atomic absorption spectrophotometer measurements (Japan Shimadzu-180-80) |
Hu et al., 2000 | China | Case-control | 36–77 | 56 | 0.797 ± 0.176 (μg/mL) | 60 | 0.908 ± 0.022 (μg/mL) | Atomic Absorption Spectrophotometer measurements |
Guo et al., 1994 | China | Case-control | 55.1 | 26 | 1.28 ± 0.94 (μg/mL) | 26 | 0.8 ± 0.25 (μg/mL) | Atomic absorption spectrophotometer measurements (Varian Spectr AA-40p, USA) |
Han et al., 1999 | China | Case-control | 4–77 | 400 | 0.93 ± 0.38 (μg/mL) | 100 | 1.1 ± 0.36 (μg/mL) | Atomic absorption spectrophotometer measurements (American PE3030) |