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Chronobiology International
The Journal of Biological and Medical Rhythm Research
Volume 40, 2023 - Issue 4
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Research Article

Disaggregating the effects of daytime and nighttime light exposures on obesity, overweight, prostate and breast cancer morbidity worldwide

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Pages 483-514 | Received 26 Sep 2022, Accepted 28 Feb 2023, Published online: 04 Apr 2023

Figures & data

Figure 1. Global changes in breast and prostate cancer incidence ASRs (a) and overweight/obesity prevalence rates, % (b).

Source: Diagrammed using data from the Global Health Data Exchange GHD (Citation2019) and WHO (Citation2022b) respectively.
Notes: Overweight is defined as BMI ≥ 25, while obesity is defined as BMI ≥ 30; the diagrams feature age-standardized rates (ASRs) are for adults only.
Figure 1. Global changes in breast and prostate cancer incidence ASRs (a) and overweight/obesity prevalence rates, % (b).

Figure 2. ALAN emissions and solar radiation worldwide.

(a) ALAN flux in 2014 (nanowatts/cm2/sr); (b) Solar radiation (kWh/m2).
Sources: Mapped using data from NOAA (Citation2020) and Agency et al. (Citation2021), respectively.
Notes: The raster resolution is ~920 m per pixel for ALAN and 250 m per pixel for solar radiation.
Figure 2. ALAN emissions and solar radiation worldwide.

Figure 3. Population-weighted ALAN and solar radiation levels by countries worldwide.

(a) Population-weighted ALAN levels (nanowatts/cm2/sr) in 2014; (b) Population-weighted solar radiation levels (kWh/m2) in 2016.
Source: Mapped using data from NOAA (Citation2020) and Agency et al. (Citation2021).
Note: Both ALAN and solar radiation averages are grouped into five classes using the Jenks natural breaks method. Due to the fact that actual exposures depend on population distribution within countries, a population-weighting procedure was implemented following Kloog et al. (Citation2008) and using data from Rose et al. (Citation2021) (see text for explanations).
Figure 3. Population-weighted ALAN and solar radiation levels by countries worldwide.

Table 1. Descriptive statistics of the research variables.

Figure 4. Morbidity rates by countries worldwide in 2016.

(a) Breast cancer (BC) incidence rate per 100,000 (ASR); (b) Prostate cancer (PC) incidence rate per 100,000 (ASR); (c) Obesity prevalence among adults (ASR, %); (d) Overweight prevalence among adults (ASR, %).
Source: Mapped using data from GHD (Citation2019) and WHO (Citation2022b). The rates are grouped into five classes using the Jenks natural breaks method.
Notes: Other years and inter-year changes are reported in Appendixes C-F.
Figure 4. Morbidity rates by countries worldwide in 2016.

Figure 4. (Continued).

Figure 4. (Continued).

Figure 5. T-statistics of the ALAN and solar radiation variables, estimated for separate years between 1998 and 2016 for different types of morbidity.

(a) BC; (b) PC; (c) Obesity; (d) Overweight.
Notes: Based on the models reported in Appendix G, . Dotted red lines indicate a 0.01 two-tailed significance level, dotted black lines indicate a 0.05 significance level (two-tailed).
Figure 5. T-statistics of the ALAN and solar radiation variables, estimated for separate years between 1998 and 2016 for different types of morbidity.

Figure 6. Relative contribution of different factors to obesity (a), overweight (b), BC (c), and PC (d).

Notes: The factors are ranked based on Model 1 and Model 22 for obesity and overweight (see Appendixes, ) and Model 44 and Model 55 for BC and PC (see Appendixes, ); the variables are sorted in the order of diminishing contribution, with the relative contribution of the strongest variable conditionally set to 100%.
Figure 6. Relative contribution of different factors to obesity (a), overweight (b), BC (c), and PC (d).

Figure A1. Population-weighted national averages of solar radiation by countries worldwide, kWh/m².

(a) Year 1998; (b) Year 2006, (c) Year 2016, (d) Percent change between 1998 and 2016; (e) Percent change between 2006 and 2016.
Source: Authors’ calculations applied to Agency et al (2021) - Global Solar Atlas (see text for explanations); Note: Solar radiation average is grouped into five classes using the Jenks natural breaks method. The solar radiation raster is annually invariant. The changes in the maps are due to changes in the population distribution (see text for explanations).
Figure A1. Population-weighted national averages of solar radiation by countries worldwide, kWh/m².

Figure A1. (Continued).

Figure A1. (Continued).

Figure B1. Population-weighted ALAN averages by countries worldwide, nanowatts/cm2/sr.

(a) Year 1996; (b) Year 2006, (c) Year 2014, (d) Percent change between 1996 and 2006; (e) Percent change between 1996 and 2014.
Source: Authors’ calculations applied to NOAA (2020) data (see text for explanations); Note: ALAN averages are grouped into five classes using the Jenks natural breaks method.
Figure B1. Population-weighted ALAN averages by countries worldwide, nanowatts/cm2/sr.

Figure B1. (Continued).

Figure B1. (Continued).

Figure C1. BC rates by countries worldwide.

(a) Year 2006; (b) Year 2016; (c) BC rate change between 2006 and 2016, %.
Source: Mapped using GHD (2019) - Global Health Data Exchange; the BC rates are grouped into five classes using the Jenks natural breaks method.
Figure C1. BC rates by countries worldwide.

Figure D1. BC rates by countries worldwide.

(a) Year 2006; (b) Year 2016; PC rate change between 2006 and 2016, %.
Source: Mapped using GHD (2019); the PC rates are grouped into five classes using the Jenks natural breaks method.
Figure D1. BC rates by countries worldwide.

Figure E1. Overweight ASR by countries worldwide, %.

(a) Year 1998, (b) Year 2016; and (c) Obesity rate change between 1998 and 2016, %.
Source: Mapped using WHO (2022b) - the World Health Organization countrywide database: the obesity rates are grouped into five classes using the Jenks natural breaks method.
Figure E1. Overweight ASR by countries worldwide, %.

Figure F1. Overweight ASR by countries worldwide, %.

(a) Year 1998, (b) Year 2016; (c) Rate change between 1998 and 2016, %.
Source: Mapped using WHO (2022a) - the World Health Organization countrywide database. Overweight rates are grouped into five classes using the Jenks natural breaks method.
Figure F1. Overweight ASR by countries worldwide, %.

Table G1. Factors affecting obesity rates in individual countries of the world (Dependent variable – Obesity, % ASR in the years 1998; 1999; 2000 and 2001; explanatory 2-year latency period, unless stated otherwise).

Table G2. Factors affecting obesity rates in individual countries of the world (dependent variable – obesity, % ASR in the years 2002; 2003; 2004 and 2005; explanatory 2-year latency period, unless stated otherwise).

Table G3. Factors affecting obesity rates in individual countries of the world (dependent variable – obesity, % ASR in the years 2006; 2007; 2008 and 2009; explanatory 2-year latency period, unless stated otherwise).

Table G4. Factors affecting obesity rates in individual countries of the world (dependent variable – obesity, % ASR in the years 2010; 2011; 2012 and 2013; explanatory 2-year latency period, unless stated otherwise).

Table G5. Factors affecting obesity rates in individual countries of the world (dependent variable – obesity, % ASR in the years 2014; 2015 and 2016; explanatory 2-year latency period, unless stated otherwise).

Table G6. Factors affecting obesity rates in individual countries of the world (dependent variable – obesity, % ASR in the years 2015 and 2016 explanatory 2-year latency period, unless stated otherwise).

Table G7. Factors affecting overweight rates in individual countries of the world (dependent variable – overweight, % ASR in the years 1998; 1999; 2000 and 2001 explanatory 2-year latency period, unless stated otherwise).

Table G8. Factors affecting overweight rates in individual countries of the world (dependent variable – overweight, % ASR in the years 2002; 2003; 2004 and 2005 explanatory 2-year latency period, unless stated otherwise).

Table G9. Factors affecting overweight rates in individual countries of the world (dependent variable – overweight, % ASR in the years 2006; 2007; 2008 and 2009 explanatory 2-year latency period, unless stated otherwise).

Table G10. Factors affecting overweight rates in individual countries of the world (dependent variable – overweight, % ASR in the years 2010; 2011; 2012 and 2013 explanatory 2-year latency period, unless stated otherwise).

Table G11. Factors affecting overweight rates in individual countries of the world (dependent variable – overweight, % ASR in the years 2014; 2015 and 2016 explanatory 2-year latency period, unless stated otherwise).

Table G12. Factors affecting overweight rates in individual countries of the world (dependent variable – overweight, % ASR in the years 2015 and 2016 explanatory 2-year latency period, unless stated otherwise).

Table G13. Factors affecting breast cancer rates in individual countries of the world (dependent variable – breast cancer rate ASR in the years 2006; 2007; 2008 and 2009 explanatory 10-year latency period, unless stated otherwise).

Table G14. Factors affecting breast cancer rates in individual countries of the world (dependent variable – breast cancer rate ASR in the years 2010; 2011; 2012 and 2013 explanatory 10-year latency period, unless stated otherwise).

Table G15. Factors affecting breast cancer rates in individual countries of the world (dependent variable – breast cancer rate ASR in the years 2014; 2015 and 2016 explanatory 10-year latency period, unless stated otherwise).

Table G16. Factors affecting prostate cancer rates in individual countries of the world (dependent variable – prostate cancer rate ASR in the years 2006; 2007; 2008 and 2009 explanatory 10-year latency period, unless stated otherwise).

Table G17. Factors affecting prostate cancer rates in individual countries of the world (dependent variable – prostate cancer rate ASR in the years 2010; 2011; 2012 and 2013 explanatory 10-year latency period, unless stated otherwise).

Table G18. Factors affecting prostate cancer rates in individual countries of the world (dependent variable – prostate cancer rate ASR in the years 2014; 2015 and 2016 explanatory 10-year latency period, unless stated otherwise).