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Table 2 Characteristics of self-harm patients associated with non-capture of NHS number: Oxford and Manchester

From: The effect of using NHS number as the unique identifier for patients who self-harm: a multi-centre descriptive study

  

Oxford

(N = 1000)

Manchester

(N = 1000)

  

N

%*

Statistic

N

%*

Statistic

Total attendances without NHS number

 

269

27

 

272

27

 

Previous self-reported self-harm

Yes

103

21

X2 = 16.6

126

25

X2 = 0.1

 

No

96

35

df = 1

68

26

df = 1

    

P < 0.001

  

P = 0.75

Alcohol use at time of self-harm

Yes

113

23

X2 = 4.2

98

24

X2 = 0.8

 

No

116

29

df = 1

86

27

df = 1

    

P = 0.04

  

P = 0.37

Living arrangement

NFA

11

32

 

9

75

 
 

Hostel or institution

25

45

 

20

36

 
 

Alone

29

19

X2 = 40.9

40

24

X2 = 23.5

 

Spouse/partner

76

29

df = 7

48

23

df = 7

 

Parent/sibling

54

24

P < 0.001

36

23

P = 0.001

 

Friends/other relatives

18

41

 

17

26

 
 

Children only

7

10

 

6

14

 
 

Student halls

18

53

 

8

31

 

Ethnicity

White

165

25

X2 = 13.6

164

23

X2 = 25.6

 

Black

7

50

df = 3

6

27

df = 3

 

South Asian

8

62

P = 0.004

20

56

P < 0.001

 

Other

7

37

 

11

48

 
  1. Completeness of independent variables: "previous self-reported self-harm" Oxford 76%; M/cr 77%, "alcohol use at time of self-harm" Oxford 89%; M/cr 74%, living arrangement Oxford 88%; M/cr 73% and "ethnicity" Oxford 70%; M/cr 79%.
  2. * percentage of category by variable with no NHS number