Outcomes by condition
Outcomes by condition are presented in Table 2. No differences in any outcome were found between the choice and integrated conditions, so they were combined allowing 2 ฅ 2 analyses (Table 1), where relevant. There were no differences in the proportion who reported making a quit attempt by the 1-month follow-up. There was a significant difference in 7-day abstinence using both all cases (missing = smoker) and those with identified outcomes. In both cases the control group had the lowest percentage quit. Those offered onQ were significantly more likely to be abstinent at 1 month [odds ratio (OR) = 1.39, 95% confidence interval (CI): 1.16–1.67],but there was no significant effect of offer of QuitCoach (OR = 0.99, 95% CI: 0.82–1.18). At the 7-month follow-up, 8.5% of the sample achieved 6-month sustained abstinence. No significant differences were found by condition, but the control condition was numerically least successful. Odds ratios for all four intervention conditions relative to the control were in the vicinity of 1.50. The only analysis to approach significance compared all four conditions combined to the control (8.9% versus 6.2%, c2 = 3.45, P = 0.063). The odds ratio for this comparison was 1.48 (95% CI: 0.98–2.24). Abstinence rates were consistently higher in the information-seeker sample than in the cold-contacted sample (see Table 3). For example, 17.5% of the information-seeker sample achieved 6-month sustained abstinence, compared with only 3.1% of those coldcontacted (P < 0.001). Within the information-seeker sample, those recruited by telephone (17.0%) were comparable to the small web-enrolled group (19.9%). A series of step wise logistic regression analyses predicting 6-month sustained abstinence were conducted,each using only intervention group at the first step, controlling for demographics and recruitment source at the second step, and smoking-related variables (cigarettes per day, initial intention to quit and a quit attempt in the past year) at the third step. The key sets of analyses, with missing cases coded as smokers, are summarized in Table 4. The first set of analyses utilized the 2 ฅ 2 design. A marginally significant main effect of offered onQ was found, which reduced slightly when the smoking-related variables were added. No significant effect was found for offered QuitCoach, although the OR was only marginally lower. There was no evidence of an interaction, suggesting no additional benefit from having been offered the
combined intervention. The second set of analyses used the binary variable which contrasted all four intervention groups with the control. Here, a significant effect at step 2 (controlling for demographics and recruitment source) was found, but this dropped to marginal significance with the addition of the smoking-related variables. In both cases, the variable that reduced the effect was baseline smoking status. No significant effects were found when we analysed only cases with valid 6-month outcomes, or when we inferred either success or last known status to the missing cases (analyses not shown).
ผลลัพธ์ตามเงื่อนไขOutcomes by condition are presented in Table 2. No differences in any outcome were found between the choice and integrated conditions, so they were combined allowing 2 ฅ 2 analyses (Table 1), where relevant. There were no differences in the proportion who reported making a quit attempt by the 1-month follow-up. There was a significant difference in 7-day abstinence using both all cases (missing = smoker) and those with identified outcomes. In both cases the control group had the lowest percentage quit. Those offered onQ were significantly more likely to be abstinent at 1 month [odds ratio (OR) = 1.39, 95% confidence interval (CI): 1.16–1.67],but there was no significant effect of offer of QuitCoach (OR = 0.99, 95% CI: 0.82–1.18). At the 7-month follow-up, 8.5% of the sample achieved 6-month sustained abstinence. No significant differences were found by condition, but the control condition was numerically least successful. Odds ratios for all four intervention conditions relative to the control were in the vicinity of 1.50. The only analysis to approach significance compared all four conditions combined to the control (8.9% versus 6.2%, c2 = 3.45, P = 0.063). The odds ratio for this comparison was 1.48 (95% CI: 0.98–2.24). Abstinence rates were consistently higher in the information-seeker sample than in the cold-contacted sample (see Table 3). For example, 17.5% of the information-seeker sample achieved 6-month sustained abstinence, compared with only 3.1% of those coldcontacted (P < 0.001). Within the information-seeker sample, those recruited by telephone (17.0%) were comparable to the small web-enrolled group (19.9%). A series of step wise logistic regression analyses predicting 6-month sustained abstinence were conducted,each using only intervention group at the first step, controlling for demographics and recruitment source at the second step, and smoking-related variables (cigarettes per day, initial intention to quit and a quit attempt in the past year) at the third step. The key sets of analyses, with missing cases coded as smokers, are summarized in Table 4. The first set of analyses utilized the 2 ฅ 2 design. A marginally significant main effect of offered onQ was found, which reduced slightly when the smoking-related variables were added. No significant effect was found for offered QuitCoach, although the OR was only marginally lower. There was no evidence of an interaction, suggesting no additional benefit from having been offered theการแทรกแซงรวม ชุดสองของการวิเคราะห์ใช้ตัวแปรฐานสองซึ่งต่างกลุ่มแทรกแซงสี่ทั้งหมดกับตัวควบคุม ที่นี่ ผลสำคัญที่ขั้นตอนที่ 2 (การควบคุมสำหรับประชากรและการสรรหาบุคลากรแหล่ง) พบ แต่นี้ความเปลี่ยนแปลงสำคัญกำไรกับการเพิ่มตัวแปรที่เกี่ยวข้องกับการสูบบุหรี่ ในทั้งสองกรณี ตัวแปรที่ลดผลถูกหลักสถานะการสูบบุหรี่ ไม่มีผลอย่างมีนัยสำคัญพบเมื่อเรา analysed เฉพาะกรณี มีผลบังคับใช้ 6 เดือนผล หรือ เมื่อเราสรุปความสำเร็จหรือสถานะที่รู้จักล่าสุดกรณีสูญหาย (วิเคราะห์ไม่แสดง)
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