Help needed to analyze a simple medical study for statistically significant difference.

#1
How best to analyze this data to show if there is a statistically significant difference within each group?

Measuring the of detection or determination of the entry of the needle bevel into the epidural space, using two different diameter needles 25 G (smaller) and 18 G (larger).

Summary of results:

Group 1: 18G needle (20 patients - not the same patients as in Group 2)

Recognition of the epidural space was confirmed by LORT in 12 patients out of 20 (60%).

By CST in all 20 patients (100%).


Group 2: 25G needle (20 patients - not the same patients as in Group 1)


Recognition of the epidural space was confirmed by LORT in 2 patients out of 20 in (10%).

By CST in all 20 patients (100%).

Please let me know if you need any more details on the study.

Thanks for your help with this.
Crispin
 

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