In an 2009 article, Why do Muslims come to Christ? Five case studies that underline the key factors as Living God in Christ, the living Word, and the living Body of Christ. by Salaam Corniche, there is a reference (on the last page) to a study of Ex-Muslim Christians in the USA.

The study was described in a 2013 blog article, Factors leading to conversion of Muslims to Christ., by Georges Houssney.

The study was a multiple-choice questionnaire answered by 100 converts who had come to the national conferences for Christians from Muslim Background held in Washington DC and New Jersey.

Under question 4, it states:

“What was the major factor in drawing you to Christ?

[...]

25% experienced dreams and visions, most of Jesus but some various dreams.

I want to know if the statistics are genuine and valid. Did they use proper scientific methods in the survey? Is there other evidence to support or reject this claims.