The effect of monthly mean global horizontal solar radiation and sunshine duration on vitamin d levels in young women

Year 2023, Volume: 7 Issue: 2, 125 - 131, 29.10.2023

Şükriye Taşçı Karagöl , Sevil Turhan , Hülya Coşkun , Seher Kır , Yusuf Emre. Bostan , Raziye Yıldız

https://doi.org/10.30565/medalanya.1274708

Abstract

Aim: The most important reason for vitamin D deficiency is the lack of synthesis in the skin. The synthesis of vitamin D can be affected by many variables such as geographical region, race, season, monthly average daily sun exposure (MADSD), monthly average daily global horizontal solar radiation (MADGHSR). In this study, we aimed to investigate possible association between vitamin D levels and MADSD and MADGHSR in young women.

Methods: This is a retrospective study evaluating the levels of Vitamin D classified by age, seasons, months, MADGHSR and MADSD in women aged between 15-45 years admitted to a secondary state hospital.

Results: All of the women involved were at reproductive age and approximately 94.6% of them had vitamin D levels below 30 ng/mL. The median (minimum-maximum) vitamin D level was 16.1 (3.6-49.4) ng/mL in summer and 14.3 (3.2-49.8) ng/mL in winter (p=0.001). The rate of vitamin D deficiency (<20 ng/mL) was 68.1% in summer and 75.1% in winter (p<0.001). The median MADGHSR was 4.6 (3.4-5.7) hours in winter and 6.9 (5.2-7.2) hours in summer and the median MADSD was 3.3 (1.6-3.5) watt/m²/day in winter and 15.2 (12.2-15.8) watt/m²/day in summer. Vitamin D level was weakly correlated with age (r=0.082, p=0.002), MADSD (r=0.075, p=0.001) and MADGHSR (r=0.062, p=0.006).

Conclusion: We found that MADGHSR and MADSD had an effect on vitamin D synthesis in addition to factors related with personal and environmental situations. We suggest that routine optimal dose vitamin D replacement is necessary in geographies similar to the population in our study.

Keywords

Vitamin D deficiency, daily sunshine duration, global solar radiation

Genç kadınlarda aylık ortalama küresel yatay güneş radyasyonu ve güneşlenme süresinin vitamin d düzeyine etkisi

Abstract

Amaç: D vitamini eksikliğine neden olan en önemli neden ciltte sentez eksikliğidir. D vitamini sentezi yaşanılan coğrafi bölge, ırk, mevsim, maruz kalınan aylık ortalama günlük güneşlenme süresi (MADSD), aylık ortalama günlük küresel yatay güneş radyasyonu (MADGHSR), gibi pekçok değişkenden etkilenebilir. Bu çalışmada genç kadınlarda D vitamini düzeyi ile MADSD ve MADGHSR değerleri arasındaki ilişkinin araştırılmasını amaçladık.

Yöntem: Bu çalışma retrospektif olarak ikinci basamak bir devlet hastanesine başvuran 15-45 yaş arasındaki kadınlarda yapıldı ve D vitamini düzeyleri yaş, mevsimler, aylar, MADGHSR ve MADSD değerlerine göre sınıflandırıldı.

Bulgular: Çalışmaya dahil edilen tüm kadınlar üreme çağında olup yaklaşık %94,6'sının D vitamini düzeyi 30 ng/mL'nin altındaydı. Ortanca (minimum-maksimum) D vitamini düzeyi yazın 16,1 (3,6-49,4) ng/mL, kışın 14,3 (3,2-49,8) ng/mL idi (p=0.001). D vitamini eksikliği (<20 ng/mL) oranı yazın %68,1 ve kışın %75,1 olarak saptandı (p<0.001). Medyan MADGHSR kışın 4,6 (3,4-5,7) saat ve yazın 6,9 (5,2-7,2) saat ve medyan MADSD kışın 3,3 (1,6-3,5) watt/m²/gün ve yazın 15,2 (12,2-15,8) watt/m²/gün bulundu. D vitamini düzeyinin yaş (r=0.082, p=0.002), MADGHSR (r=0.062, p=0.006) ve MADSD (r=0.075, p=0.001) ile zayıf korelasyon gösterdiği saptandı.

Sonuç: Bireysel ve çevresel faktörlerin yanı sıra MADGHSR ve MADSD’nin vitamin D sentezi üzerinde etkili olduğunu bulduk. Çalışmamızdaki popülasyona benzeyen coğrafyalarda rutin optimal doz D vitamini takviyesinin gerekli olduğunu düşünüyoruz.

Keywords

D vitamini eksikliği, günlük güneşlenme süresi, küresel güneş radyasyonu

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