3 ms·
There haven't been a ton of studies done, but the ones that have been carried out all show a perfect-use effectiveness of over 99%. But that definitely depends
by jaldoretta 13y ago
There haven't been a ton of studies done, but the ones that have been carried out all show a perfect-use effectiveness of over 99%. But that definitely depends on how careful users are.
- ntaso 13y agoThe sympto-thermal method is researched since the 1950s by an Austrian gynecologist. There have been A TON of studies.