Table 3.
Planned Comparisons and Hypothesized Differential Item Functioning (DIF)
| Factor | Subgroup 1 | Subgroup 2 | Subgroup 3 | Subgroup 4 | Subgroup 5 | Subgroup 6 | DIF Hypothesisa | # DIF Items (standard criterion)b | # DIF Items (sensitivity criterion)c |
|---|---|---|---|---|---|---|---|---|---|
| Gender | Male (n = 2,133) | Female (n = 3,134) | Women will report more limitations on most items | 0 items | 0 items | ||||
| Age at diagnosis | 21 to <65 (n = 3,124) | 65 or older (n = 2,143) | Older people will report more limitations on most items | 0 items | 0 items | ||||
| Ethnicity, Race | Non- Hispanic White (n = 2,203) | Non- Hispanic Black (n = 1,081) | Hispanic (n = 1,006) | Non- Hispanic Chinese (n = 314) | Non- Hispanic Filipino (n = 248) | Chinese and/or Hispanics will report more limitations on 4 items | 0 items | 0 items | |
| Language | English (n = 4,843) | Spanish (n = 322) | No items will have DIF | 0 items | 0 items | ||||
| Born in US | Yes (n = 3,736) | No (n = 1,518) | 0 items | 0 items | |||||
| Highest Education | H.S. or less (n = 1,935) | Some college or more (n = 3,298) | Higher educated will report more limitations on 1 item | 0 items | 0 items | ||||
| Income 1 | <$60,000 (n = 2,650) | $60,000+ (n = 1,744) | 0 items | 0 items | |||||
| Income 2 | <$20,000 (n = 1,184) | $20,000+ (n = 3,210) | 0 items | 0 items | |||||
| Comorbidity | 0 or 1 (n = 2,497) | 2 or more (n = 2,804) | 0 items | 0 items | |||||
| Cancer | Breast (n = 1,586) | Colorectal (n = 896) | Lung (n = 684) | NHL (n = 445) | Prostate (n = 1,126) | Uterus (n = 382) | 0 items | 0 items | |
| Breast cancer by stage | Stage 1 (n = 712) | Stage 2 (n = 572) | 0 items | 0 items | |||||
| Colorectal cancer by stage | Stage 2 (n = 225) | Stage 3 (n = 278) | 0 items | 0 items | |||||
| Prostate cancer by stage | Stage 1 (n = 273) | Stage 2 (n = 617) | 0 items | 0 items | |||||
| Stage 1 by cancer | Breast (n = 712) | Prostate (n = 273) | Uterus (n = 290) | 0 items | 1 itemd | ||||
| Stage 2 by cancer | Breast (n = 572) | Colorectal (n = 225) | Prostate (n = 617) | 0 items | 0 items | ||||
| Depressione | Yes (n = 1,020) | No (n = 4,080) | 0 items | 0 items | |||||
| Anxietyf | Yes (n = 1,013) | No (n = 4,105) | 0 items | 0 items | |||||
| Help answering questions | No (n = 4,421) | Some or all (n = 744) | 0 items | 0 items |
a
See text for description of how hypotheses were generated and which items were hypothesized to have DIF.
b
McFadden pseudo-R2 change of 0.01 or greater
c
McFadden pseudo-R2 change of 0.005 or greater
d
“I have trouble keeping up with my family responsibilities” was flagged for DIF in only one of the 18 sample characteristic comparisons (Stage 1 by cancer type: breast vs. prostate vs. uterus)
e
“Has a doctor ever told you that you had depression?”
f
“Has a doctor ever told you that you had anxiety?”