Table 2. Participant characteristics within and across studies.
| Overall (N = 8,315) | STOMP (N = 1,705) | Text2Quit (N = 503) | SMS USA (N = 164) | SMS Turkey (N = 151) | txt2stop (N = 5,792) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Treatment | Control | Treatment | Control | Treatment | Control | Treatment | Control | Treatment | Control | Treatment | Control | |
|
N = 4,202 |
N = 4,113 | N = 852 | N = 853 | N = 262 | N = 241 | N = 101 | N = 63 | N = 76 | N = 75 | N = 2,911 | N = 2,881 | |
| Smoking behavior | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) |
| Age | 33.6 (11.51) | 33.66 (11.61) | 24.86 (8.78) | 24.64 (8.63) | 35.85 (10.72) | 35.53 (10.6) | 21.63 (2.11) | 21.56 (2.12) | 36.13 (9.51) | 35.64 (10.31) | 36.31 (10.98) | 36.38 (11.09) |
| Previous quit attempts | 4.58 (8.17) | 4.35 (7.86) | 3.04 (2.55) | 2.78 (2.42) | 5.34 (7.07) | 6.89 (16.14) | 3.66 (1.61) | 2.62 (1.69) | 2.38 (1.51) | 2.36 (1.53) | 5.06 (9.42) | 4.67 (7.94) |
| Fagerstrom score | 4.63 (2.42) | 4.62 (2.44) | 4.6 (2.16) | 4.52 (2.23) | 5.36 (2.28) | 5.3 (2.33) | 3.92 (2.06) | 3.83 (2.23) | 1.87 (1.25) | 1.96 (1.49) | 4.67 (2.48) | 4.68 (2.48) |
| Demographic characteristics | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) |
| Female | 2062 (49.1) | 1995 (48.5) | 500 (58.7) | 497 (58.3) | 180 (68.7) | 150 (62.8) | 44 (43.6) | 28 (44.4) | 35 (46) | 24 (32) | 1303 (44.8) | 1296 (45) |
| SES | ||||||||||||
| Low | 1872 (44.6) | 1830 (44.5) | 364 (42.7) | 349 (40.9) | 165 (63) | 152 (63.1) | 46 (45.5) | 32 (50.8) | 23 (30.3) | 37 (49.3) | 1274 (43.8) | 1260 (43.7) |
| High | 2109 (50.2) | 2068 (50.3) | 267 (31.3) | 289 (33.9) | 97 (37) | 89 (36.9) | 55 (54.5) | 31 (49.2) | 53 (69.7) | 38 (50.7) | 1637 (56.2) | 1621 (56.3) |
| Missing | 221 (5.3) | 215 (5.2) | 221 (25.9) | 215 (25.2) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
| Smoking outcomes | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) |
| 4 weeks (PP) | ||||||||||||
| Quit smoking | 1200 (28.6) | 507 (12.3) | 243 (28.5) | 109 (12.8) | 80 (30.5) | 35 (14.5) | 44 (43.6) | 17 (27) | 13 (17.1) | 12 (16) | 820 (28.2) | 334 (11.6) |
| Smoking | 2794 (66.5) | 3441 (83.7) | 563 (66.1) | 709 (83.1) | 133 (50.8) | 183 (75.9) | 43 (42.6) | 38 (60.3) | 46 (60.5) | 48 (64) | 2009 (69) | 2463 (85.5) |
| Missing | 208 (5.0) | 165 (4.0) | 46 (5.4) | 35 (4.1) | 49 (18.7) | 23 (9.5) | 14 (13.9) | 8 (12.7) | 17 (22.3) | 15 (20) | 82 (2.8) | 84 (2.9) |
| 3 months (PP) | N = 1,291 | N = 1,232 | ||||||||||
| Quit smoking | 380 (29.4) | 231 (18.8) | 247 (29) | 160 (18.8) | 87 (33.2) | 48 (19.9) | 36 (35.6) | 19 (30.2) | 10 (13.2) | 4 (5.3) | NA | NA |
| Smoking | 691 (53.5) | 842 (68.3) | 499 (58.6) | 628 (73.6) | 123 (47.0) | 159 (66.0) | 45 (44.6) | 32 (50.8) | 24 (31.6) | 23 (30.7) | NA | NA |
| Missing | 220 (17.0) | 159 (12.9) | 106 (12.4) | 65 (7.6) | 52 (19.8) | 34 (14.1) | 20 (19.8) | 12 (19) | 42 (55.3) | 48 (64) | NA | NA |
NA = not applicable; measures are not available.