Table 2 Parallel trend test of outcome variables

Total cost per outpatient visit (CNY)

2012

0.0689

0.0327

2.11

0.044

0.0021

0.1357

2013

0.0250

0.0155

1.61

0.118

−0.0067

0.0566

2014

0.0328

0.0159

2.06

0.048

0.0003

0.0653

2015

0.0097

0.0113

0.85

0.4

−0.0135

0.0328

Drug cost per outpatient visit (CNY)

2012

0.1121

0.0326

3.43

0.002

0.0454

0.1787

2013

0.0789

0.0221

3.57

0.001

0.0337

0.1240

2014

0.0644

0.0178

3.61

0.001

0.0280

0.1008

2015

0.0588

0.0150

3.91

0

0.0281

0.0895

Examination cost per outpatient visit (CNY)

2012

0.0920

0.0780

1.18

0.248

−0.0674

0.2514

2013

0.0421

0.0385

1.09

0.283

−0.0365

0.1207

2014

0.0218

0.0287

0.76

0.453

−0.0367

0.0803

2015

−0.0294

0.0374

−0.79

0.437

−0.1058

0.0469

Total cost per inpatient admission (CNY)

2012

0.0380

0.0290

1.31

0.2

−0.0212

0.0972

2013

0.0058

0.0165

0.35

0.727

−0.0279

0.0395

2014

0.0155

0.0193

0.8

0.428

−0.0239

0.0550

2015

0.0187

0.0136

1.37

0.181

−0.0092

0.0465

Drug cost per inpatient admission (CNY)

2012

0.0909

0.0353

2.57

0.015

0.0187

0.1630

2013

0.0576

0.0276

2.08

0.046

0.0011

0.1140

2014

0.0516

0.0244

2.12

0.043

0.0018

0.1014

2015

0.0588

0.0192

3.07

0.005

0.0197

0.0980

Examination cost per inpatient admission (CNY)

2012

0.0123

0.0500

0.25

0.807

−0.0897

0.1144

2013

−0.0157

0.0304

−0.52

0.609

−0.0779

0.0464

2014

−0.0105

0.0248

−0.42

0.676

−0.0612

0.0402

2015

−0.0011

0.0174

−0.07

0.948

−0.0368

0.0345

Surgery cost per inpatient admission (CNY)

2012

−0.0073

0.0610

−0.12

0.906

−0.1319

0.1173

2013

−0.0450

0.0493

−0.91

0.369

−0.1458

0.0557

2014

−0.0768

0.0331

−2.32

0.027

−0.1444

−0.0091

2015

−0.1054

0.0384

−2.75

0.01

−0.1838

−0.0271