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Table 4 Sensitivity analysis for imputation based on the MAR versus MNAR assumption high malaria prevalence strata

From: Variation in and risk factors for paediatric inpatient all-cause mortality in a low income setting: data from an emerging clinical information network

  

Variables with no missing data

1–3 variables with missing data

4 or more variables with missing data

Mantel Haenszel estimates weighted across missing patterns (MNAR)

Model 3 - Mulitvariable model for associations with mortality on imputed data including interaction terms for malaria endemicity (MAR)

  

OR (95% CI)

OR (95% CI)

OR (95% CI)

OR (95% CI)

OR (95% CI)

Age groupa

      
 

2_6 months and high malaria prevalence

ref

ref

ref

ref

ref

 

7 _11 months in high malaria prevalence

0·43(0·29–0·63)

0·48(0·27–0·86)

0·47(0·29–0·77)

0·48(0·28–0·81)

0·43(0·29–0·63)

 

12_59 months in high malaria prevalence

0·37(0·27–0·5)

0·53(0·34–0·84)

0·35(0·23–0·54)

0·37(0·26–0·51)

0·37(0·27–0·50)

 

7 _11 months in Low malaria prevalence

0·34(0·15–0·75)

0·54(0·17–1·68)

0·09(0·02–0·35)

0·41(0·14–1·21)

0·33(0·19–0·57)

 

12_59 months in Low malaria prevalence

0·29(·14-·62)

0·59(0·21–1·72)

0·07(0·02–0·25)

0·39(0·15–1·07)

0·29(0·17–0·49)

Child sex

      
 

Female

ref

ref

ref

ref

ref

 

Male

0·67(0·57–0·79)

0·7(0·56–0·88)

0·82(0·63–1·05)

0·71(0·58–0·87)

0·67(0·57–0·79)

WAZ scorea

      
 

0 or > = 1 SD in high malaria prevalence

ref

ref

ref

ref

ref

 

Minus 1 SD in high malaria prevalence

1·19(0·85–1·67)

1·96(1·25–3·09)

1·54(0·91–2·58)

1·46(0·96–2·23)

1·19(0·85–1·67)

 

Minus 2 SD in high malaria prevalence

1·50(1·03–2·17)

1·43(0·81–2·54)

0·89(0·47–1·7)

1·29(0·79–2·12)

1·50(1·03–2·17)

 

Minus 3 SD in high malaria prevalence

3·01(2·09–4·35)

5·23(3·21–8·54)

1·76(0·95–3·25)

3·20(2·10–4·91)

3·01(2·09–4·35)

 

Minus 1 SD in Low malaria prevalence

0·93(·45–1·94)

2·20(0·8–6·01)

0·29(0·07–1·18)

1·20(0·50–2·95)

1·06(0·61–1·82)

 

Minus 2 SD in Low malaria prevalence

1·17(·56–2·44)

1·61(0·55–4·69)

0·17(·04–0·67)

1·18(0·50–2·83)

0·88(0·52–1·51)

 

Minus 3 SD in Low malaria prevalence

2·36(1·13–4·94)

5·85(2·07–16·53)

0·33(0·08–1·33)

3·06(1·26–7·65)

2·09(1·22–3·56)

Number of comorbidities

      
 

0

ref

ref

ref

ref

ref

 

1

1·08(0·86–1·37)

1·21(0·89–1·65)

0·78(0·57–1·08)

0·98(0·75–1·28)

1·08(0·86–1·37)

 

2

1·27(0·98–1·64)

1·26(0·89–1·79)

0·67(0·45–0·99)

1·19(0·88–1·62)

1·27(0·98–1·64)

 

> = 3

1·68(1·25–2·25)

1·22(0·78–1·89)

0·92(0·56–1·53)

1·20(0·80–1·82)

1·68(1·25–2·25)

History of fever

      
 

No

ref

ref

ref

ref

ref

 

Yes

0·76(0·62–0·92)

0·79(0·6–1·05)

0·76(0·5–1·17)

0·77(0·59–1·00)

0·76(0·62–0·92)

History of diarrhoea

      
 

No

ref

ref

ref

ref

ref

 

Yes

1·45(1·2–1·76)

1·05(0·8–1·39)

1·36(0·92–2)

1·32(1·02–1·71)

1·45(1·20–1·76)

convulsions

      
 

No

ref

ref

ref

ref

ref

 

Yes

1·35(1·09–1·67)

1·73(1·29–2·33)

1·67(1·13–2·47)

1·53(1·15–2·06)

1·35(1·09–1·67)

Vomitting everything

      
 

No

ref

ref

ref

ref

ref

 

Yes

1·03(0·86–1·24)

1·07(0·81–1·41)

1·11(0·79–1·57)

1·06(0·83–1·36)

1·03(0·86–1·24)

Indrawing

      
 

No

ref

ref

ref

ref

ref

 

Yes

2·48(2·08–2·96)

2·91(2·27–3·73)

2·58(1·82–3·64)

2·61(2·07–3·31)

2·48(2·08–2·96)

Pallor

      
 

None

ref

ref

ref

ref

ref

 

Some/severe

2·32(1·92–2·81)

2·22(1·71–2·87)

1·98(1·45–2·69)

2·19(1·73–2·79)

2·32(1·92–2·81)

Central cyanosis

      
 

No

ref

ref

ref

ref

ref

 

Yes

3·25(1·91–5·53)

2·37(1·1–5·11)

2·3(0·52–10·21)

2·77(1·36–6·33)

3·25(1·91–5·53)

AVPU

      
 

Alert

ref

ref

ref

ref

ref

 

Not alert (VPU)

3·95(3·16–4·95)

3·94(2·87–5·41)

4·42(2·53–7·73)

4·06(2·93–5·73)

3·95(3·16–4·95)

Ability to drinka

      
 

Ability to drink no in high malaria prevalence

ref

ref

ref

ref

ref

 

Ability to drink yes in high malaria prevalence

0·65(0·48–0·87)

0·76(0·5–1·15)

0·58(0·33–1·01)

0·66(0·45–0·98)

0·65(0·48–0·87)

 

Ability to drink yes in Low malaria prevalence

0·51(0·24–1·08)

0·85(0·31–2·34)

0·11(0·02–0·48)

0·57(0·23–1·43)

0·44(0·25–0·78)

Stiff necka

      
 

Stiff neck no in high malaria prevalence

ref

ref

ref

ref

ref

 

Stiff neck yes in high malaria prevalence

3·92(2·15–7·16)

2·24(0·94–5·31)

0·81(0·28–2·31)

2·70(1·36–5·49)

3·92(2·15–7·16)

 

Stiff neck yes in low malaria prevalence

3·07(1·31–7·17)

2·51(0·72–8·78)

0·15(0·03–0·76)

2·52(0·97–6·81)

1·53(0·81–2·90)

Skin pinch

      
 

Immediate

ref

ref

ref

ref

ref

 

1–2 s

1·17(0·94–1·44)

1·5(1·12–2·02)

1·26(0·83–1·93)

1·29(0·99–1·69)

1·17(0·94–1·44)

 

> 2 s

1·47(1·09–1·98)

2·54(1·67–3·86)

2·28(1·16–4·46)

1·96(1·25–3·15)

1·47(1·09–1·98)

Capillary refill time

      
 

<=2 scs

ref

ref

ref

ref

ref

 

>3 s

1·68(1·32–2·13)

1·08(0·67–1·76)

1·41(0·85–2·32)

1·39(0·95–2·07)

1·68(1·32–2·13)

 

Indeterminate

1·83(1·12–2·99)

1·01(0·43–2·35)

na

1·27(0·51–1·75)

1·83(1·12–2·99)

Sunken eyes

      
 

No

ref

ref

ref

ref

ref

 

Yes

1·24(1–1·55)

0·96(0·69–1·34)

1·04(0·74–1·46)

1·11(0·84–1·47)

1·24(1·00–1·55)

Jaundice

      
 

None

ref

ref

ref

ref

ref

 

Moderate/severe

1·64(1·01–2·65)

1·72(0·96–3·1)

1·78(0·97–3·27)

1·71(0·98–2·98)

1·64(1·01–2·65)

Severe wastinga

      
 

Severe wasting no in high malaria prevalence

ref

ref

ref

ref

ref

 

Severe wasting yes in high malaria prevalence

2·54(1·7–3·82)

2·41(1·27–4·58)

2·39(1·23–4·62)

2·46(1·44–4·26)

2·54(1·70–3·82)

 

Severe wasting yes in low malaria prevalence

2·45(1·17–5·13)

3·27(1·09–9·79)

0·32(0·08–1·27)

2·29(0·94–5·79)

1·66(0·95–2·87)

Oedema of malnutritiona

      
 

Oedema none in high malaria prevalence

ref

ref

ref

ref

ref

 

Oedema mild/moderate in high malaria prevalence

3·13(1·95–5·02)

2·92(1·44–5·92)

1·66(0·67–4·13)

2·78(1·55–5·10)

3·13(1·95–5·02)

 

Oedema mild/moderate in Low malaria prevalence

1·94(0·96–3·90)

2·70(0·98–7·47)

0·45(0·11–1·91)

2·02(0·88–4·81)

1·88(1·08–3·25)

Malaria endemicity

      
 

High

ref

ref

ref

ref

ref

 

Low

0·78(0·43–1·42)

1·12(0·49–2·53)

0·19(0·06–0·63)

0·76(0·38–1·58)

0·78(0·43–1·42)

  1. Model 3 stratified by number of missing variables and weighted estimates across the missing patterns (assumes MNAR) compared to pooled model 3 data (assumes MAR)
  2. aVariables with significant interactions with malaria endemicity