No es una opinion subjetiva. He estudiado estadística y economia, así que de esto algo se. La muestra a mayor y mas aleatoria mas representativa y estadística significativa es su estudio. Una muestra de 56 tios no es para nada significativo comparado con una de 3000. Luego, su aleatoriedad, de donde ha sacado a esos tios? Porque si ha cogido a los de propeciahelp, eso de aleatorio no tiene nada y por lo tanto estaríamos hablando de un estudio totalmente sesgado.
Luego lo que dices del estudio japonés es falso. El estudio se llama: Evaluation of efficacy and safety of finasteride 1mg in 3177 Japanese men with AGA. Lo dice bien claro, Safety, ergo analiza ambas cosas, su eficacia y si es un medicament seguro, y las conclusions ya las sabes.
Aqui te dejo el estudio:
https://www.ncbi.nlm.nih.gov/pubmed/21980923
Pero eh, que no es suficiente? No problema, aquí te dejo uno de una muestra de 17000 y pico individuos con problemas de próstata, es decir que les dieron no 1mg sino 5mg!
https://academic.oup.com/jnci/article/9 ... n-Reported
Compara eso con tus 56 tios. Es ridículo, y te invito a que le preguntes a cualquier académico experto en materia. Como te dije yo estudie economia así que puedo pasarte contactos, pero te adelanto que no le darán mucha validez a tu paper.
Y bueno, por si no tienes suficientes, aquí te pego unos cuantos estudios mas:
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http://jnci.oxfordjournals.org/content/99/13/1025.long (n=17,313) Overview of sexual side effects from the PCPT trial. "The effect of finasteride on sexual functioning is minimal for most men"
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http://www.ncbi.nlm.nih.gov/pubmed/8881946 (n=14,772) Observational cohort study. "Impotence or ejaculatory failure, decreased libido and gynaecomastia in a small proportion of patients were associated with the use of finasteride. This drug is acceptably safe when used in accordance with the current prescribing information."
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http://www.ncbi.nlm.nih.gov/pubmed/12477383 (n=8,820) Overview of BPH Trials. "Significantly more sexual dysfunction, impotence, ejaculation disorder and decreased libido occurred with finasteride at 12 months; the NNH for any sexual dysfunction at 12 months was 14"
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http://www.ncbi.nlm.nih.gov/pubmed/20956649 (n=3,927) Review of efficacy and safety for treating hair loss. "Moderate-quality evidence suggests that daily use of oral finasteride increases hair count and improves patient and investigator assessment of hair appearance, while increasing the risk of sexual dysfunction."
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http://www.ncbi.nlm.nih.gov/pubmed/9610579 (n=3,270) Long-term safety study of finasteride in use for BPH.
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http://www.ncbi.nlm.nih.gov/pubmed/21980923 (n=3,177) Study on 3,177 japanese men for hair loss. "Adverse reactions occured in 0.7% (23/3,177) of men; seven men discontinued treatment based on risk-benefit considerations. No specific safety problems associated with long-term use were observed."
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http://www.ncbi.nlm.nih.gov/pubmed/12639651 (n=3,040) PLESS placebo controlled safety study of finasteride for treating BPH. "Compared with placebo, men treated with finasteride experienced new drug-related sexual AEs with an increased incidence only during the first year of therapy."
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http://www.ncbi.nlm.nih.gov/pubmed/10197842 (n=895) 5-year efficacy and safety study of finasteride. "Finasteride was well tolerated, with no significant increase in the prevalence of sexual adverse events over time."
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http://www.ncbi.nlm.nih.gov/pubmed/12670567 (n=725) 6-year placebo controlled study on finasteride. "no increase in the prevalence of drug-related adverse events over time."
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http://www.ncbi.nlm.nih.gov/pubmed/11763381 (n=472) Evaluation of sexual side effects in 1mg finasteride. "The sexual and erectile function of subjects taking finasteride does not significantly differ from that of age-matched controls. This is consistent with the experience of many dermatologists who do not see sexual or erectile dysfunction in patients taking Propecia."
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http://www.ncbi.nlm.nih.gov/pubmed/12695131 (n=424) 2-year efficacy and safety of 1mg finasteride. "Treatment with finasteride 1 mg was generally well tolerated."
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http://www.ncbi.nlm.nih.gov/pubmed/23067029 (n=378) Safety assessment of fin vs dut. "The incidence of erectile dysfunction, ejaculatory dysfunction and decreased libido resulting in discontinuation from therapy for finasteride was (2.1%, 1.8%, 1.4% respectively."
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http://www.ncbi.nlm.nih.gov/pubmed/15262698 (n=186) Evaluation of sexual function for 1mg finasteride. "Our results support the clinical impression that sexual side effects are actually much less common than reported in clinical trials. The sexual function of all patients remained stable during treatment with 1 mg of finasteride." (This is less than 200 participants, but I included it since it was more relevant due to it being conducted on younger men)
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2840927/ (n=N/A) Finasteride and it's impact on sexual function and prostate cancer. (This is a retrospective analysis, but I wanted to include it because it analyzed some of the studies I posted and also gives some great information)
Ahi tienes como unos 12 estudios o asi, la mayoria de ellos con una muestra mas significativa que el tuyo.
Ahora dime porque tu estudio vale mas que todos esos, dime va.
Pero que vamos, todo esto yo siempre te lo pongo, creo que es la tercera vez que te publico todos esos papers y como siempre no respondes o tiras balones fuera xD.
Y por cierto, deberias informarte mas sobre el efecto placebo. Hay un programa llamado Redes de Eduard Punset donde habla de este y lo poderosa que puede ser la sugestion, de ahi a que siempre pongan mucho enfasis en quitar esa variable de la ecuacion.