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Table 3 Estimation of trend and seasonal variation of diarrhoea cases in Plateau State in each quarter of the study period

From: Patterns of diarrhoeal disease among under-five children in Plateau State, Nigeria, 2013–2017

Year

Quarter

Number of diarrhoea cases (yL)

3-Qtr Moving Total

3-Qtr Moving average

Trend (TL)

Seasonal variation

SV=

(yL-TL)

2013

Q1

1439

   

Q2

2437

6852

2284.00

153.00

Q3

2976

6588

2196.00

780.00

Q4

1175

7501

2500.33

− 1325.33

2014

Q1

3350

6515

2171.67

1178.33

Q2

1990

8762

2920.67

− 930.67

Q3

3422

8474

2824.67

597.33

Q4

3062

9036

3012.00

50.00

2015

Q1

2552

7765

2588.33

−36.33

Q2

2151

9084

3028.00

− 877.00

Q3

4381

10,231

3410.33

970.67

Q4

3699

11,467

3822.33

− 123.33

2016

Q1

3387

10,422

3474.00

−87.00

Q2

3336

9951

3317.00

19.00

Q3

3228

10,454

3484.67

−256.67

Q4

3890

10,298

3432.67

457.33

2017

Q1

3180

10,624

3541.33

− 361.33

Q2

3554

10,440

3480.00

74.00

Q3

3706

11,280

3760.00

−54.00

Q4

4020

   
  1. ITLPQ Increase in trend line per quarter