Table 3 OLS regression on the effect of preschool attendance on student reading achievement

Original sample

Constant

560.2

544.7

538.0

510.9

571.8

578.1

544.4

520.0

547.4

[552.1, 568.3]

[539.5, 549.9]

[531.2, 544.7]

[498, 523.8]

[561.8, 581.8]

[571.8, 584.3]

[538.4, 550.5]

[506.8, 533.2]

[539.7, 555.1]

Treatment

−37.4

−41.7

−60.2

−21.3

−18.7

−76.8

−64.2

−30.0

−41.6

[−64.5, −10.3]

[−71.6, −11.8]

[−88.5, −31.9]

[−48.2, 5.6]

[−29.6, −7.8]

[−103.2, −50.5]

[−84.5, −43.8]

[−54.1, −5.9]

[−104.4, 21.1]

Covariates

No

No

No

No

No

No

No

No

No

N

1707

2986

2380

2376

3740

4054

3939

6007

3599

Matched sample

Constant

536.3

524.6

491.0

490.5

561.0

545.2

498.4

502.5

517.6

[510.7, 561.9]

[497.7, 551.5]

[475, 507.1]

[458.2, 522.7]

[549.9, 572.1]

[519.6, 570.7]

[483.4, 513.3]

[484.4, 520.7]

[506.1, 529.2]

Treatment

−13.5

−21.6

−13.3

−0.8

−7.9

−43.9

−18.1

−12.5

−11.8

[−48.7, 21.7]

[−57.5, 14.3]

[−37.2, 10.6]

[−36.4, 34.7]

[−22.0, 6.2]

[−78.2, −9.6]

[−39.5, 3.3]

[−35.0, 10.1]

[−33.9, 10.2]

Covariates

No

No

No

No

No

No

No

No

No

N

106

102

508

188

1184

160

494

316

398

Matched sample with covariates as controls

Constant

518.2

421.8

363.4

409.4

448.4

479.9

495.9

384.3

430.1

[394.1, 642.3]

[327.9, 515.8]

[297.9, 428.9]

[322.4, 496.4]

[402.0, 494.8]

[398, 561.8]

[420.8, 571.0]

[291.5, 477.0]

[353.4, 506.8]

Treatment

−13.4

−19.2

−17.1

−5.1

−3.5

−39.8

1.2

−14.5

−19.6

[−44.1, 17.3]

[−50.6, 12.2]

[−37.0, 2.9]

[−35.5, 25.4]

[−16.0, 9.0]

[−64.2, −15.5]

[−17.2, 19.6]

[−33.4, 4.3]

[−36.6, −2.5]

Covariates

Yes^a

Yes^a

Yes^a

Yes^a

Yes^a

Yes^a

Yes^a

Yes^a

Yes^a

N

106

102

508

188

1184

160

494

316

398