From here on, reported statistics are for the sample of persons reporting low mood at wave 2. The overall incidence rate of SRO (occurring between the wave 1 and wave 2 interviews) was 28.2% (SE = 0.33%). Table 2 shows weighted percentages and ORs for wave 2 SRO by smoking history, prior SRO and the control variables as reported in wave 1. Unadjusted ORs and 95% CI for future SRO are shown as reference points. The AORs and 95% CIs show significantly higher risk of wave 2 SRO for both wave 1 current smokers (AOR=1.41, 95% CI 1.28 to 1.55) and former smokers (AOR=1.32, 95% CI 1.21 to 1.43) relative to never smokers. The difference in point estimates of risk between current versus former smokers was not significant (χ2=1.95, p=0.16).
