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. 2013 Feb 5;10(2):e1001376. doi: 10.1371/journal.pmed.1001376

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 14 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.

a

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.