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Find the most profitable Kindle niche categories

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Category name Best seller rank 50th book's rank Median sales($) Median price ($) Volatility (%) New releases (%) Self pub.(%) KDP Select (%) Competition
Books > Medical Books > Medicine > Internal Medicine > Infectious Disease 299 49,593 $3,796 $16.95 95% 15% 55% 3% ~ 10,000
Books > Health, Fitness & Dieting > Diseases & Physical Ailments > Heart Disease 991 51,157 $4,059 $13.18 90% 20% 40% 7% ~ 3,000
Books > Health, Fitness & Dieting > Diseases & Physical Ailments > Alzheimer's Disease 1,598 60,311 $3,931 $11.7 100% 10% 20% 0% ~ 4,000
Books > Medical Books > Medicine > Internal Medicine > Infectious Disease > Communicable Diseases 226 65,956 $2,664 $15.86 95% 15% 35% 7% ~ 9,000
Books > Health, Fitness & Dieting > Diseases & Physical Ailments > Parkinson's Disease 22,093 178,987 $453 $16.21 100% 15% 40% 13% ~ 977
Books > Health, Fitness & Dieting > Diseases & Physical Ailments > Cancer > Prostate Disease 9,224 265,129 $398 $14.24 100% 10% 50% 7% ~ 884
Books > Medical Books > Medicine > Internal Medicine > Infectious Disease > Parasitology 11,934 503,617 $466 $16.67 95% 10% 55% 10% ~ 1,000
Books > Medical Books > Medicine > Internal Medicine > Infectious Disease > Tropical Medicine 32,182 1,389,023 $0 $18.28 100% 15% 40% 20% ~ 1,000