I-value positive predictive (PPV) ikutshela ukuthi kungenzeka kangakanani ukuthi unesifo uma uhlola ukuthi ulungile. Kuchazwa njengenani lezitho zangempela (abantu abahlolwayo abanesifo) bahlukaniswe inani eliphelele labantu abahlolwayo abahle. Ihlukahluka nokuhlolwa kobuvivinyo, ukucaciswa kokuhlolwa, nokusabalalisa kwesifo .
Ungabona ukuthi lezi zici zishintsha kanjani i-PPV yokuhlola esibonelweni esingezansi. I-PPV yinto enzima odokotela ukulinganisa, okungaba nzima kumaziguli. Noma kunjalo, kuncike kakhulu ekukhuleni kwesifo emiphakathini lapho basebenza khona. Ukukwazi ukuzwela nokucacisa akukwanele ukutshela ukuthi yi-PPV. Kumele ube nomqondo omuhle wokuthi isifo sifana kanjani nokuthi uhlola.
Izibonelo
Cabanga ukuthi ukuhlolwa kwe-chlamydia kune-80% ukuzwela nokucacisa okungu-80%. Esikhathini samaphesenti angu-100 anesisindo se-chlamydia se-10%:
I-8/10 izimo zangempela zizohlola okuhle
Imilinganiselo engu-72/90 yangempela izohlolwa okungalungile
Kuvivinyo olungama-26, ama-8 ayiqiniso. 18 bangamanga. Ngakho-ke inani elihle lokubikezela (PPV) liyoba ngu-31% (8/26). Ingxenye eyodwa kuphela kwezintathu zabantu abahlolwayo abazoba ne-chlamydia.
Ngakolunye uhlangothi, uma ukusabalalisa kwe-chlamydia kwakuyi-30%:
24/30 izimo zangempela zizohlolwa kahle
56/70 ukungalingani kweqiniso kuzakuvivinya okungalungile.
Kulesi simo, i-PPV izoba ngu-24/38 = 63%. Ukubili kokubili kokuhlolwa kwesibalo sabantu kuzoba nomphumela wokuhlolwa olunembile.
Kuthiwani ngokuhlolwa okungu-80% inzwa. futhi i-95% spec. ku-20%?
Ukuhlola kwangempela ngo-16/20 kuyahlolwa
76/80 yeqiniso - izohlola -
Futhi i-PPV yayizoba ngu-16/20 = 80%
Izinto Ezingezayo PPV
Ukwandisa amaphesenti wezinto eziqotho kanye nokuhlolwa kwe-PPV kudinga eyodwa noma zombili izinto. Ukuhlolwa kungaba nokucaca okuphezulu. Iningi labantu abangenayo i-chlamydia lizohlolwa kabi. Khona-ke, bekuyoba nemibono embalwa kakhulu yamanga. Enye into eyenza ukuhlolwa kwe-PPV kuphakame kakhulu.
Iphesenti elikhulu labantu abanesifo, i-PPV ephakeme.
Ezimweni eziningi, wonke umuntu angathanda ukwandisa ukuhlolwa okukhethekile. Ukuba nabantu abaningi begula kuphela ukuze kuthuthukiswe ukusebenza kovivinyo lokuxilonga kungathi kuyinkinga enembile.