Article Related content Article metrics Rapid responses Response Rapid Response: Re: What is recall bias? You say: "However, women who slept on their back or on their right side on the previous night (before stillbirth or interview) had more than twice the risk of a late stillbirth compared with women who slept on their left side." But Stacey et al, the authors you quote, give as their results: "...(adjusted odds ratio for back sleeping 2.54 (95% CI 1.04 to 6.18), and for right side sleeping 1.74 (0.98 to 3.01))." By convention, if the odds ratio includes 1.0 then the result is not significant. So right side sleeping had no effect in this study. J.R. Johnstone PhD 7 Bruce St, Nedlands 6009, Western Australia 08 9386 7080 0408 990 936 ray@iinet.com.au www.iinet.com.au/~ray Competing interests: No competing interests 27 May 2012 Jeffrey R. Johnstone retired none none 7 Bruce St, Nedlands 6009, Western Australia
Rapid Response:
Re: What is recall bias?
You say: "However, women who slept on their back or
on their right side on the previous night (before
stillbirth or interview) had more than twice the risk
of a late stillbirth compared with women who slept on
their left side." But Stacey et al, the authors you
quote, give as their results:
"...(adjusted odds ratio for back sleeping 2.54 (95%
CI 1.04 to 6.18), and for right side sleeping 1.74
(0.98 to 3.01))."
By convention, if the odds ratio includes 1.0 then
the result is not significant. So right side sleeping
had no effect in this study.
J.R. Johnstone PhD
7 Bruce St,
Nedlands 6009,
Western Australia
08 9386 7080
0408 990 936
ray@iinet.com.au
www.iinet.com.au/~ray
Competing interests: No competing interests