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To explore the relationship between smartphones usage, internet usage and subjective, objective cognitive functions.
Multi-stage cluster random sampling method was used to select 45-70 year old permanent residents from 7 sample villages in Pingyin County, Shandong Province who meet the standards. The subjective cognitive decline-questionnaire 9 (SCD-Q9) and the montreal cognitive assessment basic scale (MoCA-B) were used to evaluate the subjective and objective cognitive functions, respectively. The logistic regression model was used to calculate the odds ratio (OR) and 95% confidence interval (95% CI) of the relationship between smartphones usage, internet usage and subjective, objective cognitive function. Furthermore, the non-linear relationship between smartphones usage, internet usage and cognitive function scores was explored.
This study included 1 654 participants. Compared with those who did not use mobile phones, those who used mobile phones had a 42% lower risk of experiencing abnormal objective cognitive scores (OR=0.58, 95% CI: 0.46-0.73), and the risk of abnormal objective cognitive scores was relatively low when using a mobile phone for less than or equal to 2 hours per day or more than 2 hours per day (0.65, 0.51-0.82; 0.69, 0.55-0.88). Compared to those who did not use the internet, internet users had a 41% lower risk of experiencing abnormal objective cognitive scores (0.59, 0.47-0.74), and people who spent less than 1 hour online or more than 2 hours online had a lower risk of experiencing abnormal objective cognitive scores compared to those who spent less than or equal to 1 hour online (0.65, 0.52-0.83; 0.66, 0.52-0.83). Nonlinear correlation showed that as the duration of mobile phone use and internet usage gradually increased, the objective cognitive score showed a trend of first increasing and then decreasing.
People who use mobile phones and the internet have a lower risk of experiencing objective cognitive score abnormalities. As the duration of mobile phone use and internet usage increases, the objective cognitive score shows a non-linear trend of first increasing and then decreasing. Overuse of mobile phones and the internet (such as>5.5 h/d) may have adverse effects on cognitive function.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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