Table 6. Likelihood of receipt of surgery by SEP group (non-universal health care systems).
Study | No. Receiving Surgery | Cohort No./No. Eligible | Rate | Stage(s) Included | Histology | OR/Rate in Q1 (95% CI) | OR/Rate in Q2 (95% CI) | OR/Rate in Q3 (95% CI) | OR/Rate in Q4 (95% CI) | OR/Rate in Q5 (95% CI) | p-Value | Quality Score | Meta-Analysis | Further Information |
Bradley et al, 2008 [57] | 1336 | 2626 | 50.88 | I,II,IIIa | NSCLC | 1.00 | 0.80 (0.67 to 0.98) | <0.05 | 4 | Y | ||||
Esnoala et al, 2008 [60] | NR | 2791 | local | NSCLC | 1.00 | 0.67 (0.51 to 0.88) | 0.005 | 4 | Y | |||||
Greenwald et al, 1998 [61] | 3053 | 5157 | 59.20 | I | NSCLC | 1.076 | <0.0001 | 6 | N | SE = 0.011 (no CIs shown) | ||||
Hardy et al, 2009 [62] | 11834 | 19658 | 60.20 | I,II | NSCLC | 1.00 | 0.92 (0.84 to 1.14) | 0.78 (0.75 to 1.03) | 0.68 (0.60 to 0.77) | >0.05, >0.05, <0.05 | 5 | Y | Individual p values reported corrected OR supplieda | |
Lathan et al, 2008 [64] | 4563 | 9688 | 47.10 | I,II,III | NSCLC | 1.06 (1.02 to 1.11) | NR | 5 | N | Subset of Lathan et al (2006) pop | ||||
Ou et al, 2008 [70] | 16185 | 19700 | 82.16 | I | NSCLC | 86.9 | 84.8 | 81.1 | 79.6 | 74.5 | <0.001 | 2 | N | |
Smith et al, 1995 [66] | 801 | 2813 | 28.47 | local | NSCLC | 1.04 (0.90 to 1.19) | >0.001 | 5 | N | |||||
Tammemagi et al, 2004 [72] | NR | 1155 | I,II | NSCLC | 1.19 (1.03 to 1.30) | 0.02 | 2 | N | Univariable OR | |||||
Bach et al, 1999 [67] | 550 | 860 | 63.95 | I,II | NSCLC | 67.5 | 61.9 | NR | 2 | N | Surgery (blacks) | |||
Bach et al, 1999 [67] | 7763 | 10124 | 76.68 | I,II | NSCLC | 78.0 | 70.7 | NR | 2 | N | Surgery (whites) | |||
Polednak, 2001 [65] | 1385 | 1564 | 88.55 | I,II | NSCLC | 1.00 | 1.27 (0.74 to 2.18) | 1.15 (0.65 to 2.03) | 1.17 (0.67 to 2.04) | 1.78 (1.05 to 3.01) | >0.05, >0.05, >0.05, <0.05 | 4 | Y | Odds of not receiving surgery, individual p values reported |
Smith et al, 1995 [66] | 57 | 2396 | 2.38 | distant | NSCLC | 1.27 (0.97 to 1.67) | >0.001 | 5 | N | |||||
Suga et al, 2010 [71] | NR | 12395 | NSCLC | 1.17 | <0.001 | 2 | N | Surgery after invasive staging, no CIs | ||||||
Suga et al, 2010 [71] | NR | 12395 | NSCLC | 1.18 | <0.001 | 2 | N | Surgery after non-invasive staging, no CIs | ||||||
Lathan et al, 2006 [69] | NR | 14224 | NSCLC | 1.05 (1.02 to 1.08) | NR | 2 | N | |||||||
Yang et al, 2010 [74] | NR | NR | all | all | 24.6 | 22.2 | 20.7 | 18.3 | <0.01 | 2 | N | Univariable analysis |
Some studies reported SEP quintiles but others reported SEP in 2, 3, or 4 categories or as a continuous variable. Details of the number of SEP groups per study are given in Tables 1–4 in the column entitled “No. of SEP groups.” Quality scores range from 1 (lowest quality) to 6 (highest quality). Meta-analysis: Y, included in final meta-analysis; Y(S), included in sensitivity meta-analysis; N, not included in meta-analysis. Q1, high socioeconomic position; Q5, low socioeconomic position.
We are grateful to the authors for supplying a corrected OR to allow inclusion of this study in the meta-analysis.
CI, confidence interval; non-UHCS, non-universal health care system; NR, not reported; OR, odds ratio; pop, population; SE, standard error; SEP, socioeconomic position.