Dataset:  toothw.dat

Source: S. Nathoo, et al (2001). "Comparative 7-Day Clinical Evaluation
of Two Tooth Whitening Products," Compend. Contin. Educ. Dent. 22(7):599-604.

Description: Comparative Trial Measuring Effects of Two Doses (5% and 10%
carbomide peroxide) in 60 patients (parallel groups).

Rows/variaables/columnss

Rows 1-2  (assuming balanced design)
Dose  1-2
Sample size  6-7
Mean  10-13
SD    17-20

Rows 5-8
Dose 1-2
Sample size  6-7
Transient sensitivity   13  /0=No,, 1=Yes  */
Count   18-19