Vibrating toothbrush, ice, or topical anesthetic agent to reduce pain of local anesthetic injection in 5- to 12-year-old children undergoing dental procedures — a randomized controlled trial

Ain-Shams Journal of Anesthesiology

Table 2 Distribution of mean and SD of age in the three groups

Group	N	Mean age in years	Std. deviation	Std. error	95% confidence interval for mean
Group	N	Mean age in years	Std. deviation	Std. error	Lower bound	Upper bound
Vibration	30	8.80	2.355	0.430	7.92	9.68
Ice	30	9.47	2.345	0.428	8.59	10.34
Topical	30	9.10	2.734	0.499	8.08	10.12