Variable

Unmatched/Matched

Mean

% bias

% reduct

|bias|

t-test

Treated

Control

t

p > |t|

Nation

U

0.81073

0.82202

−2.9

−0.69

0.492

M

0.81055

0.81157

−0.3

90.9

−0.06

0.953

Area

U

0.37463

0.45033

−15.4

−3.63

0.000

M

0.375

0.382

−1.4

90.8

−0.33

0.744

Age

U

12.271

12.575

−17.6

−4.14

0.000

M

12.273

12.324

−3.0

83.2

-0.67

0.503

Grade

U

5.9649

6.3328

−18.6

−4.37

0.000

M

5.9678

6.0159

−2.4

86.9

−0.55

0.581

Gender

U

0.54146

0.51904

4.5

1.06

0.290

M

0.54102

0.53001

2.2

50.9

0.50

0.618

Learning_eva

U

2.7488

2.7666

−2.1

−0.49

0.628

M

2.7485

2.7546

−0.7

65.7

−0.16

0.873

Key_school

U

0.2439

0.23344

2.5

0.58

0.563

M

0.24414

0.24553

−0.3

86.7

−0.07

0.942

Education_exp

U

0.81073

0.78808

5.7

1.33

0.184

M

0.81055

0.80718

0.8

85.1

0.19

0.846

Education_m

U

6.2634

6.6283

−8.1

−1.91

0.057

M

6.2637

6.2232

0.9

88.9

0.20

0.838

Education_f

U

7.8302

7.7831

1.2

0.27

0.784

M

7.8262

7.7376

2.2

−87.9

0.51

0.613

Child_num

U

1.9776

1.8949

9.5

2.24

0.025

M

1.9775

1.9649

1.5

84.7

0.32

0.748

Ln_income

U

8.7311

8.9191

−15.9

−3.72

0.000

M

8.7316

8.7012

2.6

83.8

0.55

0.580