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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1930 1
1931 2
1942 1
1943 2
1945 9
1947 1
1948 1
1949 5
1950 1
1952 1
1959 3
1960 1
1962 3
1963 2
1964 1
1965 1
1967 4
1968 1
1969 1
1970 1
1971 4
1972 5
1973 4
1974 7
1975 3
1976 8
1977 5
1978 8
1979 9
1980 16
1981 9
1982 16
1983 15
1984 28
1985 27
1986 109
1987 127
1988 157
1989 175
1990 165
1991 192
1992 220
1993 223
1994 253
1995 226
1996 380
1997 474
1998 459
1999 570
2000 618
2001 683
2002 587
2003 703
2004 564
2005 671
2006 830
2007 915
2008 1107
2009 1186
2010 1327
2011 1412
2012 1568
2013 1849
2014 2277
2015 2547
2016 2660
2017 2784
2018 3099
2019 3251
2020 3983
2021 4346
2022 4939
2023 4699
2024 5473
2025 6292
2026 2787

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The following term was not found in PubMed: uifei
Page 1
Sleep status among adults.
Zhang X, Wang X, Qu H, Zhang W, Weng W, Li Q. Zhang X, et al. Sleep Breath. 2026 May 19;30(3):165. doi: 10.1007/s11325-026-03713-z. Sleep Breath. 2026. PMID: 42154404
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