Ngokocwaningo lwakamuva lwaseMelika, ukuchayeka ekukhanyeni okunamandla okwenziwa ngaphandle ebusuku kwandisa ingozi yomdlavuza wegilo ngama-55%. 

Izibani zasemgwaqweni namafasitela ezitolo akhanyayo ebusuku aphazamisa iwashi langaphakathi, futhi andisa ingozi yokuba nomdlavuza wegilo ngama-55%. Lokhu kuvezwe wucwaningo olwenziwa cishe iminyaka engu-13 ngabacwaningi baseNyuvesi yaseTexas, e-United States, olwanyatheliswa ngoFebhuwari 8 ephephabhukwini i-American Cancer Society. Ukuze lifinyelele lesi siphetho, ithimba lososayensi lalandela iminyaka engu-12,8 abantu abadala baseMelika abangu-464 elalibabuthe ngo-371 no-1995. Ngaleso sikhathi, babephakathi kuka-1996 no-50 ubudala. Babe sebelinganisela amazinga okukhanya okwenziwa ebusuku kubahlanganyeli besebenzisa isithombe sesathelayithi. Idatha ehambisana naleyo ye-National Cancer Registry ukukhomba ukuxilongwa komdlavuza we-thyroid kuze kufike ku-71. Ngenxa yalokho, amacala e-2011 omdlavuza we-thyroid atholwe, i-856 emadodeni kanye ne-384 kwabesifazane. Abacwaningi baveza ukuthi izinga eliphezulu lokukhanya lihlotshaniswa nengozi ephakeme engu-472% yokuba nomdlavuza wegilo. Abesifazane babenezinhlobo eziningi zomdlavuza wasendaweni kuyilapho amadoda ethinteka kakhulu yizigaba ezithuthuke kakhulu zesifo. 

“Njengocwaningo lokubheka, ucwaningo lwethu alwakhelwanga ukusungula isixhumanisi esiyimbangela. Ngakho-ke, asazi ukuthi amazinga aphezulu okukhanya kwangaphandle ebusuku aholela engcupheni ephakeme yomdlavuza wegilo; nokho, uma kubhekwa ubufakazi obumisiwe obusekela indima yokuchayeka kokukhanya ebusuku nokuphazamiseka kwesigqi se-circadian, sithemba ukuthi ucwaningo lwethu luzogqugquzela abacwaningi ukuthi baqhubeke bahlole ubudlelwano phakathi kokukhanya kwasebusuku nokukhanya kwasebusuku. umdlavuza, nezinye izifo, kusho uDkt. Xiao, umbhali ophambili walo msebenzi. Muva nje, imizamo yenziwe kwamanye amadolobha ukunciphisa ukungcoliswa kokukhanya, futhi sikholelwa ukuthi izifundo zesikhathi esizayo kufanele zihlole ukuthi le mizamo ibe nomthelela kangakanani empilweni yabantu, "uqhubeka. Olunye ucwaningo ngakho-ke kufanele lwenziwe ukuze kuqinisekiswe le miphumela.