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Table 1 Number of cases, incidence rates and hazard ratios (HRs) for mental disorder diagnostic categories by parental income quintile during birth year

From: Parental income as a marker for socioeconomic position during childhood and later risk of developing a secondary care-diagnosed mental disorder examined across the full diagnostic spectrum: a national cohort study

 

n

Incidence rate

Basic adjustmenta

Additional adjustmentb

Any mental disorder

 Q1

30,626

1512

2.09 (2.05, 2.13)

1.52 (1.49, 1.55)

 Q2

23,328

1108

1.53 (1.50, 1.56)

1.33 (1.30, 1.36)

 Q3

19,853

929

1.28 (1.25, 1.31)

1.20 (1.17, 1.22)

 Q4

17,813

826

1.14 (1.11, 1.16)

1.10 (1.08, 1.13)

 Q5

15,774

726

1.00 (Ref.)

1.00 (Ref.)

Substance misuse disorder

 Q1

6480

284

3.44 (3.27, 3.62)

1.95 (1.85, 2.07)

 Q2

4008

174

2.10 (1.99, 2.22)

1.63 (1.54, 1.72)

 Q3

3096

134

1.62 (1.53, 1.72)

1.43 (1.35, 1.52)

 Q4

2479

107

1.29 (1.22, 1.37)

1.22 (1.15, 1.30)

 Q5

1917

83

1.00 (Ref.)

1.00 (Ref.)

Personality disorders

 Q1

7858

347

2.76 (2.64, 2.88)

1.78 (1.70, 1.87)

 Q2

5317

232

1.85 (1.76, 1.93)

1.53 (1.46, 1.60)

 Q3

4201

183

1.45 (1.38, 1.52)

1.33 (1.26, 1.39)

 Q4

3735

163

1.29 (1.23, 1.36)

1.24 (1.18, 1.30)

 Q5

2889

126

1.00 (Ref.)

1.00 (Ref.)

Broadly defined schizophrenia

 Q1

4715

206

2.38 (2.25, 2.50)

1.74 (1.64, 1.84)

 Q2

2937

127

1.47 (1.39, 1.55)

1.34 (1.26, 1.42)

 Q3

2427

105

1.21 (1.14, 1.28)

1.19 (1.12, 1.26)

 Q4

2151

93

1.07 (1.01, 1.14)

1.08 (1.01, 1.15)

 Q5

2002

87

1.00 (Ref.)

1.00 (Ref.)

Mood disorders

 Q1

10,482

465

1.72 (1.67, 1.78)

1.32 (1.27, 1.36)

 Q2

8497

374

1.38 (1.34, 1.43)

1.23 (1.19, 1.28)

 Q3

7256

318

1.18 (1.14, 1.22)

1.12 (1.08, 1.16)

 Q4

6629

291

1.08 (1.04, 1.11)

1.05 (1.01, 1.09)

 Q5

6151

270

1.00 (Ref.)

1.00 (Ref.)

Anxiety/somatoform disorders

 Q1

18,683

854

2.11 (2.06, 2.17)

1.50 (1.46, 1.54)

 Q2

14,109

634

1.57 (1.52, 1.60)

1.36 (1.32, 1.40)

 Q3

11,938

533

1.31 (1.28, 1.35)

1.23 (1.20, 1.27)

 Q4

10,776

480

1.18 (1.15, 1.22)

1.15 (1.12, 1.18)

 Q5

9130

406

1.00 (Ref.)

1.00 (Ref.)

Eating disorders

 Q1

2143

93

0.90 (0.85, 0.96)

0.88 (0.82, 0.93)

 Q2

1909

83

0.80 (0.75, 0.85)

0.83 (0.78, 0.89)

 Q3

2096

91

0.88 (0.83, 0.93)

0.92 (0.87, 0.98)

 Q4

2045

89

0.86 (0.81, 0.92)

0.89 (0.84, 0.94)

 Q5

2355

102

1.00 (Ref.)

1.00 (Ref.)

  1. Q = quintile. The reference group is quintile 5 (HR = 1). Incidence rate is reported per 100,000 person years
  2. aBasic adjustment—hazard ratios adjusted for gender, birth year and calendar time
  3. bAdditional adjustment—hazard ratios adjusted for gender, birth year, calendar time, parental mental disorders, parental educational attainment level, degree of urbanicity at birth and number of changes in child-parental separation status between birth and 15th birthday
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