Table 2.
Study sample compared to NHIS samples (pooled 2012, 2013 2014 data).
| Characteristic | Enrolled study sample (N=5,290) | NHIS current adult smokers (Unweighted N=19,043) | NHIS current adult smokers who searched for health info on the Internet AND made at least one quit attempt in the past year (Unweighted N=3,664) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| % (95% CIa) | Weightedb % (SE) | Study/NHIS OR (95% CIc) | Study - NHIS Δ% (95% CId) | Study - NHIS Effect size (Cohen’s h) | Weightedb % (SE) | Study/NHIS OR (95% CIc) | Study - NHIS Δ% (95% CId) | Study - NHIS Effect size (Cohen’s h) | |
| Gender; Female | 60.8 (59.5, 62.1) | 45.3 (0.6) | 1.9 (1.8, 2.0) | 15.5 (13.8, 17.2) | 0.31 | 55.3 (1.2) | 1.3 (1.1, 1.4) | 5.5 (2.8, 8.1) | 0.11 |
| Ethnicity; Hispanic | 5.6 (5.0, 6.2) | 10.3 (0.3) | 0.5 (0.5, 0.6) | −4.7 (−5.6, − 3.8) | −0.18 | 8.7 (0.6) | 0.6 (0.5, 0.8) | −3.1 (−4.5, − 1.8) | −0.12 |
| Race; White | 80.1 (79.0, 81.1) | 81.0 (0.5) | 0.9 (0.8, 1.0) | −0.9 (−2.3, 0.5) | −0.02 | 82.2 (0.8) | 0.9 (0.8, 1.0) | −2.1 (−4.0, − 0.1) | −0.05 |
| Employed | 57.0 (55.7, 58.3) | 59.1 (0.5) | 0.9 (0.9, 1.0) | −2.1 (−3.7, − 0.4) | −0.04 | 64.2 (1.2) | 0.7 (0.7, 0.8) | −7.2 (−10.0, −4.5) | −0.15 |
| Education; Some college or more | 72.6 (71.4, 73.8) | 44.7 (0.6) | 3.3 (3.0, 3.6) | 27.9 (26.2, 29.6) | 0.58 | 60.0 (1.5) | 1.8 (1.5, 2.0) | 12.7 (9.4, 15.9) | 0.27 |
| Married or living with partner | 51.7 (50.4, 53.0) | 53.1 (0.6) | 1.0 (0.9, 1.0) | −1.4 (−3.1, 0.4) | −0.03 | 55.0 (1.5) | 0.9 (0.8, 1.0) | −3.3 (−6.5, − 0.2) | −0.07 |
| Every day smoking | 96.2 (95.7, 96.7) | 77.4 (0.5) | 7.5 (6.4, 8.7) | 18.8 (17.8, 19.9) | 0.60 | 71.6 (1.1) | 10.2 (8.5, 12.1) | 24.7 (22.5, 26.8) | 0.73 |
| 1+ quit attempts past year | 68.5 (67.2, 69.7) | 47.4 (0.5) | 2.4 (2.3, 2.6) | 21.1 (19.5, 22.7) | 0.43 | 100.0 (0.0) | N/A | N/A | N/A |
| Cigarettes per day; 20 or more | 40.9 (39.6, 42.2) | 28.9 (0.5) | 1.7 (1.6, 1.8) | 12.0 (10.3, 13.6) | 0.25 | 19.5 (0.9) | 2.9 (2.5, 3.2) | 21.3 (19.2, 23.5) | 0.47 |
| Received cessation advice | 62.1 (60.7, 63.4) | 50.6 (0.5) | 1.6 (1.5, 1.7) | 11.5 (9.8, 13.2) | 0.23 | 61.9 (1.2) | 1.0 (0.9, 1.1) | 0.2 (−2.5, 2.9) | 0.004 |
| Age group (screening) | |||||||||
| 18–24 | 10.4 (9.6, 11.2) | 12.8 (0.5) | 0.8 (0.7, 0.9) | −2.4 (−3.6, − 1.2) | −0.08 | 17.0 (1.4) | 0.6 (0.5, 0.7) | −6.6 (−9.4, − 3.8) | −0.19 |
| 25–44 | 45.3 (43.9, 46.6) | 40.2 (0.5) | 1.2 (1.2, 1.3) | 5.1 (3.4, 6.7) | 0.10 | 48.8 (1.2) | 0.9 (0.8, 1.0) | −3.5 (−6.2, − 0.9) | −0.07 |
| 45–64 | 40.1 (38.8, 41.4) | 37.9 (0.6) | 1.1 (1.0, 1.2) | 2.2 (0.5, 3.9) | 0.05 | 31.0 (1.3) | 1.5 (1.3, 1.7) | 9.1 (6.3, 11.9) | 0.19 |
| 65+ | 4.3 (3.8, 4.9) | 9.1 (0.3) | 0.5 (0.4, 0.5) | −4.8 (−5.6, − 4.1) | −0.19 | 3.2 (0.4) | 1.3 (1.0, 1.8) | 1.0 (0.1, 2.0) | 0.06 |
a
95% CI’s obtained using approximate Chi-square CI’s for single sample proportions;
b
Point estimates and corresponding standard errors were obtained from the corresponding subgroup of the pooled 2012–2014 NHIS data using the appropriate weighted design;
c
95% CI’s were obtained via normal approximation for log odds ratios;
d
95% CI’s were obtained via normal approximation for differences of two proportions.