Table 9. Likelihood of receipt of radiotherapy by SEP group (universal health care systems).
| Study | No. Receiving Radio | Cohort No./No. Eligible | Rate | 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 |
| Berglund et al, 2012 [22] | 1054 | 2771 | 38.04 | any | 1.00 | 1.16 (0.88 to 1.54) | 1.17 (0.90 to 1.53) | 1.18 (0.91 to 1.53) | 0.99 (0.77 to 1.29) | 0.67 | 6 | Y | Stage III only, p for trend |
| Campbell et al, 2002 [35] | 412 | 653 | 63.09 | any | 1,00 | 2.08 (1.11 to 3.91) | 2.27 (1.24 to 4.16) | 1.47 (0.83 to 2.60) | 1.86 (1.05 to 3.28) | 0.378 | 5 | Y | P for trend |
| Jack et al, 2003 [39] | NR | 32818 | any | 1.00 (0.99 to 1.02) | 0.2048 | 4 | N | ||||||
| Jack et al, 2006 [40] | 338 | 695 | 48.63 | any | 1.00 | 1.24 (0.76 to 2.02) | 0.76 (0.46 to 1.26) | 0.98 (0.60 to 1.59) | 0.68 (0.41 to 1.14) | 0.0978 | 6 | Y | Subset of Jack et al (2003) pop, p for trend |
| Jones et al,2008 [41] | 13857 | 34923 | 39.68 | any | 0.99 (0.99 to 1.00) | <0.01 | 4 | N | |||||
| Rich et al, 2011(1) [46] | 12079 | 59592 | 20.27 | any | 1.00 | 1.08 (1.01 to 1.16) | 1.12 (1.04 to 1.20) | 1.12 (1.04 to 1.20) | 1.02 (0.95 to 1.09) | 0.80 | 5 | Y(S) | P for trend |
| Hui et al, 2005 [51] | NR | 526 | any | 52 | 62 | 51 | 55 | 55 | 0.84 | 2 | N | Univariable rate | |
| Stevens et al, 2009 [55] | 222 | 555 | 40.00 | any | 1.0 | 0.8 (0.4 to 1.5) | 0.6 (0.3 to 1.2) | 0.9 (0.5 to 1.6) | 0.7 (0.4 to 1.3) | >0.05 | 2 | N | Hosp pop, univariable OR |
| Berglund et al, 2010 [19] | 863 | 3369 | 25.62 | NSCLC | 0.91 (0.67 to 1.22) | 1.12 (0.93 to 1.36) | 1.00 | NR | 6 | Y | |||
| Erridge et al, 2002 [37] | 824 | 3177 | 25.94 | NSCLC/unknown | 1.00 | 0.94 (0.70 to 1.26) | 1.04 (0.79 to 1.38) | 1.33 (1.01 to 1.75) | 1.13 (0.84 to 1.51) | 0.10 | 6 | Y | |
| Mahmud et al, 2003 [42] | 1265 | 4451 | 28.42 | NSCLC | 26.1 | 29.0 | 29.9 | NR | 2 | N | Univariable rate | ||
| Cartman et al, 2002 [50] | 693 | 2448 | 28.31 | SCLC | 37.1 | 39.5 | NR | 1 | N | Univariable rate |
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.
CI, confidence interval; NR, not reported; OR, odds ratio; pop, population; SEP, socioeconomic position; UHCS, universal health care system.