title: Does Low Body Mass Index Matter? Relationship between Body Mass Index and Subjective Well-Being among Long-Lived Women over 95 Years of Age.
abstract: OBJECTIVE
  To examine the relationship between body mass index (BMI) and subjective well-being (SWB) among long-lived women over 95 years of age and evaluate whether this relationship is mediated by functional ability.
  
  
  METHODS
  Retrospective cohort study.
  
  
  METHODS
  Data from the Rugao longevity cohort, a population-based study in Rugao, China.
  
  
  METHODS
  A sample of 342 long-lived women (mean age 97.4 ± 2.1, range 95-107) whose SWB and other covariates were available were included in this study.
  
  
  METHODS
  BMI was calculated as weight in kilograms divided by height in meters-squared (kg/m(2)). SWB was measured by life satisfaction (LS), positive affect (PA), negative affect (NA) and affect balance (AB). Functional ability was assessed by the Katz Index of Activities of Daily Living (ADL).
  
  
  RESULTS
  According to BMI classification standards for China, the underweight group had lower levels of LS than the normal and overweight groups (28.62 vs. 30.51 and 31.57, respectively; p<.05). Correlation analysis showed that BMI was significantly related to LS (r = 0.166, p<.01). The strength of the BMI and LS association was diminished when ADL was included in the general linear regression models. Mediation analysis revealed that ADL mediated this relationship (effect size = 22.6%). We did not observe significant associations of BMI with other SWB components (PA, NA, and AB).
  
  
  CONCLUSIONS
  For long-lived women, low BMI, rather than elevated BMI, is an indicator of poor psychological well-being. The findings call for public health awareness about low body weight in long-lived women, especially in those with physical disabilities when focusing on quality of life.
authors.affiliation: Xiaofeng Wang, School of Life Sciences, Fudan University, 220 Handan Rd., Shanghai 200433, China. Tel+86 21 65643714; Fax: +86 21 65642426; E-mail address: xiaofengautomatic@gmail.com.
authors.forename: Z
authors.initials: Z
authors.lastname: Liu
authors.forename: J
authors.initials: J
authors.lastname: Huang
authors.forename: D
authors.initials: D
authors.lastname: Qian
authors.forename: F
authors.initials: F
authors.lastname: Chen
authors.forename: J
authors.initials: J
authors.lastname: Xu
authors.forename: S
authors.initials: S
authors.lastname: Li
authors.forename: L
authors.initials: L
authors.lastname: Jin
authors.forename: X
authors.initials: X
authors.lastname: Wang
mesh_terms: D000203:Activities of Daily Living; D000367:Age Factors; D000368:Aged; D015992:Body Mass Index; D001835:Body Weight; D002681:China; D005260:Female; D006801:Humans; D008136:Longevity; D008603:Mental Health; D009765:Obesity / Q000150:complications / Q000523:psychology*; D050177:Overweight; D010549:Personal Satisfaction; D011788:Quality of Life; D012189:Retrospective Studies; D013851:Thinness / Q000150:complications / Q000523:psychology*
references.citation: J Gerontol A Biol Sci Med Sci. 2002 Dec;57(12):M772-7
references.pmid: 12456735
references.citation: PLoS One. 2009 Jul 29;4(7):e6423
references.pmid: 19641616
references.citation: Zhonghua Liu Xing Bing Xue Za Zhi. 2002 Feb;23(1):5-10
references.pmid: 12015100
references.citation: J Psychosom Res. 2002 Oct;53(4):935-42
references.pmid: 12377306
references.citation: Int J Geriatr Psychiatry. 2013 Mar;28(3):227-32
references.pmid: 22492613
references.citation: Emotion. 2005 Jun;5(2):208-25
references.pmid: 15982086
references.citation: J Gerontol A Biol Sci Med Sci. 2003 Mar;58(3):232-7
references.pmid: 12634289
references.citation: Am J Epidemiol. 2013 Dec 1;178(11):1591-9
references.pmid: 24013201
references.citation: Nutrition. 1997 Jun;13(6):524-34
references.pmid: 9263233
references.citation: Epidemiol Rev. 2013;35:181-97
references.pmid: 23372024
references.citation: Arch Gerontol Geriatr. 2010 Sep-Oct;51(2):231-4
references.pmid: 20042245
references.citation: Aust N Z J Psychiatry. 2013 May;47(5):477-82
references.pmid: 23526473
references.citation: JAMA. 1963 Sep 21;185:914-9
references.pmid: 14044222
references.citation: Am Psychol. 2000 Jan;55(1):34-43
references.pmid: 11392863
references.citation: J Am Med Dir Assoc. 2014 Feb;15(2):150.e11-6
references.pmid: 24291347
references.citation: J Psychosom Res. 2006 Mar;60(3):219-27
references.pmid: 16516652
references.citation: Soc Sci Med. 1993 Mar;36(5):641-55
references.pmid: 8456334
references.citation: J Am Geriatr Soc. 2012 Feb;60(2):238-42
references.pmid: 22283832
references.citation: Aust N Z J Public Health. 2003;27(4):434-40
references.pmid: 14705308
references.citation: Health Psychol. 2011 Nov;30(6):728-35
references.pmid: 21604881
references.citation: Br Med J. 1976 Jan 3;1(6000):7-9
references.pmid: 1247732
references.citation: Ann Behav Med. 2002 Summer;24(3):169-80
references.pmid: 12173674
references.citation: Age (Dordr). 2014 Jun;36(3):9632
references.pmid: 24590626
references.citation: Psychol Aging. 1992 Mar;7(1):158-63
references.pmid: 1558701
references.citation: J Nutr Health Aging. 2015 Jan;19(1):70-6
references.pmid: 25560819
references.citation: Age Ageing. 1997 Mar;26(2):107-14
references.pmid: 9177667
references.citation: Body Image. 2007 Jun;4(2):165-77
references.pmid: 18089262
references.citation: Age Ageing. 1999 Mar;28(2):147-52
references.pmid: 10350411
references.citation: Int J Geriatr Psychiatry. 2004 Jan;19(1):68-74
references.pmid: 14716701
references.citation: Gerontologist. 1969 Autumn;9(3):179-86
references.pmid: 5349366
references.citation: J Nutr Health Aging. 2015 Jan;19(1):20-5
references.pmid: 25560812
references.citation: Geriatr Gerontol Int. 2014 Feb;14 Suppl 1:15-28
references.pmid: 24450557
references.citation: Health Psychol. 2010 Jan;29(1):9-19
references.pmid: 20063931
references.citation: BMC Public Health. 2013 Mar 16;13:231
references.pmid: 23496885
references.citation: Am Psychol. 2012 Nov;67(8):590-7
references.pmid: 23163434
references.citation: BMC Public Health. 2012 Jan 19;12:54
references.pmid: 22260168
references.citation: J Frailty Aging. 2012;1(4):152-61
references.pmid: 25383356
references.citation: J Psychosom Res. 2006 Mar;60(3):229-35
references.pmid: 16516653
references.citation: J Pers Soc Psychol. 1986 Dec;51(6):1173-82
references.pmid: 3806354
references.citation: J Gerontol. 1985 Mar;40(2):244-50
references.pmid: 3973367
references.citation: Am J Public Health. 2000 Feb;90(2):251-7
references.pmid: 10667187