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Life expectancy by NS-SEC Structure, technical and conceptual issues
Life expectancy by NS-SEC Structure, technical and conceptual issues
Introduction
Introduction
Background
Background
Registrar Generals social class
Registrar Generals social class
Life expectancy at birth by social class, for male & females, England
Life expectancy at birth by social class, for male & females, England
What is NS-SEC
What is NS-SEC
NS-SEC operational and analytical categories
NS-SEC operational and analytical categories
Part of NS-SEC derivation matrix
Part of NS-SEC derivation matrix
Life Table (illustrative)
Life Table (illustrative)
Period and Cohort Life expectancy
Period and Cohort Life expectancy
LS Structure
LS Structure
What can the LS offer the study of life expectancy by social
What can the LS offer the study of life expectancy by social
Hierarchy for assignment of socio- economic class
Hierarchy for assignment of socio- economic class
Person-years at risk
Person-years at risk
Structure of Life Expectancy by NS-SEC project
Structure of Life Expectancy by NS-SEC project
Components of the project
Components of the project
NS-SEC90 analytic classes using SOC90
NS-SEC90 analytic classes using SOC90
Technical issues
Technical issues
Comparability of OPCS CO80 occupation codes and SOC90 unit groups
Comparability of OPCS CO80 occupation codes and SOC90 unit groups
Solutions
Solutions
Part of NS-SEC80 derivation matrix
Part of NS-SEC80 derivation matrix
Validation  cross-tab of 1993 deaths
Validation cross-tab of 1993 deaths
Conceptual problem
Conceptual problem
Period life expectancy  males at birth
Period life expectancy males at birth
Period life expectancy  females at birth
Period life expectancy females at birth
Period life expectancy  men aged 65
Period life expectancy men aged 65
Period life expectancy  women aged 65
Period life expectancy women aged 65
Summary
Summary

: Life expectancy by NS-SEC. : Myer Glickman. : Life expectancy by NS-SEC.ppt. zip-: 162 .

Life expectancy by NS-SEC

Life expectancy by NS-SEC.ppt
1 Life expectancy by NS-SEC Structure, technical and conceptual issues

Life expectancy by NS-SEC Structure, technical and conceptual issues

and results BSPS 8 Sept 2011

Brian Johnson ONS Health & Life Events Division Newport Brian.johnson@ons.gsi.gov.uk

2 Introduction

Introduction

Why life expectancy by NS-SEC? What is NS-SEC and how is it derived? Why is the ONS Longitudinal Study vital to this analysis? Main technical problems and approach to them Conceptual concerns Summary results

3 Background

Background

ONS has produced life expectancy by Registrar Generals social class (RGSC) for the period 1972-2005 In 2001 RGSC was replaced by NS-SEC for official statistics Need to produce life expectancy by NS-SEC This is how it was done

4 Registrar Generals social class

Registrar Generals social class

Non-manual I Professional II Managerial and technical IIIN Non-manual skilled Manual IIIM Manual skilled IV Manual semi-skilled V Manual unskilled

5 Life expectancy at birth by social class, for male & females, England

Life expectancy at birth by social class, for male & females, England

and Wales, 1972-2005. Non-manual vs Manual

Source: ONS Longitudinal study

Males

Females

6 What is NS-SEC

What is NS-SEC

Socio-economic classification based on occupation Conceptually based on employment relations Job security/prospects/autonomy service contract relationship labour contract relationship

7 NS-SEC operational and analytical categories

NS-SEC operational and analytical categories

Source: Rose D and Pevalin D (ed) (2003) A Researchers Guide to the National Statistics Socio-economic Classification.

8 Part of NS-SEC derivation matrix

Part of NS-SEC derivation matrix

1.1

Employers in large organisations and higher managers

1.2

Higher professional occupations

4

Self-employed and own account workers

2

Lower managerial and professional occupations

Source: ONS (2002): The NS-SEC User Manual

9 Life Table (illustrative)

Life Table (illustrative)

10 Period and Cohort Life expectancy

Period and Cohort Life expectancy

Period life expectancy (shown here) reflects mortality rates prevailing at all ages during calendar period to which it refers Therefore life expectancy at birth for child born in 2004 is the number of years that child could expect to live if age-specific mortality rates stayed as in 2004 Cohort life expectancy allows for anticipated future changes in mortality rates projection implies element of subjectivity

11 LS Structure

LS Structure

1971 Original sample: 530,000 members; selected from 1971 Census

2001 540,000 sample members found at 2001 Census

12 What can the LS offer the study of life expectancy by social

What can the LS offer the study of life expectancy by social

classification?

Based on census returns and administrative sources low levels of attrition (compared with survey data) Can attribute social indicator (eg. social class/occupation) several years before death no need to rely on death registration Eliminates numerator-denominator bias - uses actual person-years at risk as denominator

13 Hierarchy for assignment of socio- economic class

Hierarchy for assignment of socio- economic class

14 Person-years at risk

Person-years at risk

15 Structure of Life Expectancy by NS-SEC project

Structure of Life Expectancy by NS-SEC project

NS- SEC D E R I V A T I O N

Life Tables

M A T R I C E S 81 91 01

Deaths & Pyrs program

NS-SEC80 Derivation Matrix project

Members Occupation/emp status at census 81,91,01

Cancelled Ciphers

NS-SEC Classifica-tion program

Non-members Occupation/emp status at census 81,91,01

New births 80s,90s,00s Father/mother Occ/emp status

Own NS-SEC

Losses to Follow up

Fathers Mothers Spouses NS-SEC

Age-specific mortality rates

Fathers Mothers NS-SEC At birth

16 Components of the project

Components of the project

Construct NS-SEC80 derivation matrix using 1981 occupational classification and employment status to produce (reduced) NS-SEC classification for 1981 Census Construct own NS-SEC at each census where present 3. Construct fathers, mothers and spouses NS-SEC at 1981, 1991 & 2001 censuses where present, using LS non-members file 4. Construct fathers and mothers NS-SEC for 1980s, 1990,s and 2000s new births 5. Construct hierarchical scheme for assigning sec to each LS member, using own or fathers, mothers, or spouses class 6. Adapt rule-based programs to obtain age-specific mortality rates by NS-SEC

17 NS-SEC90 analytic classes using SOC90

NS-SEC90 analytic classes using SOC90

18 Technical issues

Technical issues

No one-to-one mapping of CO80 to SOC90 There is a bridge coding which applies to both 1981 and 1991 But 1981 Census occupations not classified by it!

19 Comparability of OPCS CO80 occupation codes and SOC90 unit groups

Comparability of OPCS CO80 occupation codes and SOC90 unit groups

SOC90

CO80

46%

16%

38%

Source: OPCS (1991) Standard Occupational Classification, Volume 3, HMSO

20 Solutions

Solutions

Map those occupations which have exact or near-exact linkage Add other occupations which are not uniquely linked but map to the same standard NS-SEC analytic groups Use empirically based rules to estimate the rest (approx 3% of population)

21 Part of NS-SEC80 derivation matrix

Part of NS-SEC80 derivation matrix

NS-SEC analytic classes

22 Validation  cross-tab of 1993 deaths

Validation cross-tab of 1993 deaths

23 Conceptual problem

Conceptual problem

NS-SEC was designed for the economic structure of 2000 not 1980 May be criticised as conceptually invalid But empirically, it works!

24 Period life expectancy  males at birth

Period life expectancy males at birth

Source ONS Longitudinal Study

25 Period life expectancy  females at birth

Period life expectancy females at birth

Source ONS Longitudinal Study

26 Period life expectancy  men aged 65

Period life expectancy men aged 65

Source ONS Longitudinal Study

27 Period life expectancy  women aged 65

Period life expectancy women aged 65

Source ONS Longitudinal Study

28 Summary

Summary

ONS has a series of trends in life expectancy by (RG) social class Has now developed a series by NS-SEC also using the ONS Longitudinal Study (published Feb 2011*) Similar pattern of socio-economic gradient apparent in results *For full description of methods and context of results see Health Statistics Quarterly volume 49 http://www.ons.gov.uk/ons/rel/hsq/health-statistics-quarterly/trends-in-life-expectancy-by-the-national-statistics-socio-economic-classification-1982-2006/health-inequalities-in-the-21st-century.pdf

Life expectancy by NS-SEC
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