According to Le Figaro in Paris the number one cause of death among manouche guitarists is argument concerning the placement of ninth or tenth fret markers leading to duels or other forms of violins.
I think the problem with the data set is that blues and jazz have existed a great deal of time longer than metal or hip hop, and the data points are somewhat skewed in terms of time. It makes sense that blues or jazz musicians have a higher mortality rate due to medical conditions compared to metal or rap. Just my $.02.
Many complain that they are the only Gypsy jazz guitarist in their town. Don't despair, according to this study, the lack of musical competition is adding years to your life:
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Stress caused by bitter rivalry led to premature deaths of leading 19th century composers, study suggests
Competition from just one extra composer working in the same city reduced longevity by more than two years, research showed