Table 7.
Group 1 | Group 2 | Item # | Item description | DIF contrast a | SE | t-value | p |
---|---|---|---|---|---|---|---|
Junior high and below | Senior high and above | E9 | Eating | 0.50 | 0.23 | 2.23 | 0.03 |
Female | Male | S2 | Sexual activity | −0.86 | 0.42 | 2.05 | 0.048 |
HIV-positive | HIV-negative | Ps3 | Think | 0.63 | 0.24 | 2.64 | 0.01 |
HIV-positive | HIV-negative | Ps6 | Negative feelings | −0.62 | 0.24 | 2.62 | 0.01 |
HIV-positive | HIV-negative | S1 | Personal relationship | −0.71 | 0.30 | 2.37 | 0.02 |
HIV-positive | HIV-negative | S2 | Sexual activity | 0.64 | 0.29 | 2.18 | 0.03 |
HIV-positive | HIV-negative | E7 | Health services | −0.57 | 0.26 | 2.20 | 0.03 |
aDIF contrasts were calculated as: logit of Group 1 – logit of Group 2; a positive value indicates that a patient in Group 1 has a higher item score than a patient who has the same QoL level in Group 2, and a negative value indicates that a patient in Group 1 has a lower item score than a patient who has the same QoL level in Group 2.
HIV: Human immunodeficiency virus.
Reversely coded items are in italics.