Researchers conducted a review of four controlled trials that compared disciplinary spanking against other cooperation-focused discipline strategies. The studies looked at whether spanking leads to better child compliance than methods like reasoning, time-outs, or other non-physical approaches. The analysis combined data from these trials to get a clearer picture of what the evidence shows.
The review found no significant difference in how well spanking worked compared to other discipline strategies when it came to getting children to comply. The effect size was small and not statistically meaningful. This means that, according to this limited set of studies, spanking didn't produce better results than other approaches.
It's important to understand that the researchers identified serious problems with the trials they reviewed. They noted the studies lacked both internal validity (how well they were designed) and external validity (how well they represent real-world situations). Different meta-analyses on this topic have reached inconsistent conclusions, so this finding isn't definitive.
Readers should take from this that the evidence about spanking's effectiveness remains unclear and contested. The review doesn't prove spanking is ineffective, but it does suggest that when compared to other cooperation-focused approaches in these particular studies, it didn't show an advantage. More rigorous research would be needed to draw firmer conclusions.