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Table 4 The gross rate of pregnancy between the two groups

From: Efficacy of a combined contraceptive regimen consisting of condoms and emergency contraception pills

Intervention group

Control group

Month

No. Sub. Of not use condom

No. Preg.

Cumulative condom use rate

Cumulative of pregnancy gross rate

SE of Cumulative pregnancy gross rate

No. Sub. Of not use condom

No. Preg.

Cumulative condom use rate

Cumulative of pregnancy gross rate

SE of Cumulative pregnancy gross rate

X

Wx

Ex

P(x)

Qe(x+1)

Sqe(x+1)

Wx

Ex

P(x)

Qe(x+1)

Sqe(x+1)

0

0

4

0.99505

0.00495

0.002469

0

0

1.00000

0.00000

0.000000

1

0

1

0.99381

0.00619

0.002764

1

1

0.99864

0.00136

0.001358

2

0

2

0.99128

0.00872

0.003283

0

1

0.99727

0.00273

0.001926

3

0

1

0.99000

0.01000

0.003519

0

0

0.99727

0.00273

0.001926

4

0

1

0.98872

0.01128

0.003742

0

2

0.99451

0.00549

0.002738

5

0

2

0.98614

0.01386

0.004153

0

1

0.99313

0.00687

0.003065

6

0

1

0.98484

0.01516

0.004344

0

0

0.99313

0.00687

0.003065

7

0

1

0.98354

0.01646

0.004528

0

1

0.99173

0.00827

0.003365

8

0

0

0.98354

0.01646

0.004528

0

1

0.99033

0.00967

0.003640

9

0

3

0.97963

0.02037

0.005042

0

0

0.99033

0.00967

0.003640

10

0

1

0.97833

0.02167

0.005201

0

0

0.99033

0.00967

0.003640

11

0

0

0.97833

0.02167

0.005201

0

2

0.98752

0.01248

0.004138

12

0

0

0.97833

0.02167

0.005201

0

0

0.98752

0.01248

0.004138

Total

0

17

— —

— —

— —

1

9

— —

— —

— —