You are seeing a free-to-access but limited selection of the activity Altmetric has collected about this research output.
Click here to find out more.
X Demographics
Mendeley readers
Attention Score in Context
| Title |
Decreasing sperm quality: a global problem?
|
|---|---|
| Published in |
BMC Public Health, January 2010
|
| DOI | 10.1186/1471-2458-10-24 |
| Pubmed ID | |
| Authors |
Hiltrud Merzenich, Hajo Zeeb, Maria Blettner |
| Abstract |
Carlsen and coworkers (1992) reviewed 61 heterogeneous observational studies on semen quality published between 1938 and 1990. This review indicates that mean sperm density decreased significantly between 1940 and 1990. An extended meta-analysis with 101 studies confirmed a decline in sperm density for the period from 1934 to 1996 (2000). The key message of the meta-analyses is that sperm counts have decreased globally by about 50% over the past decades. This assessment has been questioned. |
X Demographics
The data shown below were collected from the profiles of 6 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Finland | 1 | 17% |
| Unknown | 5 | 83% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 5 | 83% |
| Practitioners (doctors, other healthcare professionals) | 1 | 17% |
Mendeley readers
The data shown below were compiled from readership statistics for 103 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Spain | 1 | <1% |
| United States | 1 | <1% |
| Canada | 1 | <1% |
| South Africa | 1 | <1% |
| Unknown | 99 | 96% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Ph. D. Student | 21 | 20% |
| Student > Bachelor | 19 | 18% |
| Student > Master | 12 | 12% |
| Researcher | 12 | 12% |
| Student > Doctoral Student | 5 | 5% |
| Other | 11 | 11% |
| Unknown | 23 | 22% |
| Readers by discipline | Count | As % |
|---|---|---|
| Agricultural and Biological Sciences | 22 | 21% |
| Medicine and Dentistry | 20 | 19% |
| Biochemistry, Genetics and Molecular Biology | 11 | 11% |
| Social Sciences | 5 | 5% |
| Veterinary Science and Veterinary Medicine | 4 | 4% |
| Other | 14 | 14% |
| Unknown | 27 | 26% |
Attention Score in Context
This research output has an Altmetric Attention Score of 57. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 05 February 2023.
All research outputs
#743,361
of 25,312,451 outputs
Outputs from BMC Public Health
#762
of 16,970 outputs
Outputs of similar age
#2,707
of 175,421 outputs
Outputs of similar age from BMC Public Health
#3
of 76 outputs
Altmetric has tracked 25,312,451 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 97th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 16,970 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 14.6. This one has done particularly well, scoring higher than 95% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 175,421 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 98% of its contemporaries.
We're also able to compare this research output to 76 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 97% of its contemporaries.