Table 2

Index group means and matching estimator results for days plucking tea and non-plucking days for men

Duration on ART

N

Days Plucking (IG Mean)\1

Estimated Mean Difference

(IG – CG)\1

P > |z|\2

95% CI LL\2

95% CI UL\2

Days Non-Plucking Tasks (IG Mean)

Estimated Mean Difference

(IG – CG)\1

P > |z|\2

95% CI LL\2

95% CI UL/2


-24

41

16.59

-0.43

0.78

-3.42

2.57

4.76

-0.47

0.75

-3.30

2.36

-23

41

17.02

0.46

0.76

-2.49

3.40

5.85

1.26

0.39

-1.58

4.09

-22

41

15.22

-1.30

0.43

-4.50

1.90

6.17

2.22

0.13

-0.64

5.08

-21

41

16.20

-0.62

0.72

-4.03

2.80

6.56

2.82

0.08

-0.31

5.94

-20

41

15.10

-2.33

0.16

-5.58

0.92

6.88

2.81

0.07

-0.24

5.85

-19

41

15.80

-2.41

0.12

-5.48

0.65

4.93

0.82

0.56

-1.90

3.53

-18

41

14.61

-3.30

0.04

-6.37

-0.22

6.83

2.25

0.13

-0.67

5.16

-17

41

15.66

-2.86

0.06

-5.88

0.16

5.73

3.07

0.02

0.54

5.60

-16

41

17.07

-2.24

0.14

-5.24

0.75

3.10

0.32

0.77

-1.81

2.45

-15

41

16.39

-2.34

0.18

-5.74

1.07

3.34

0.61

0.63

-1.85

3.07

-14

41

16.71

-1.66

0.26

-4.57

1.25

4.59

-0.17

0.89

-2.62

2.27

-13

41

17.12

0.13

0.93

-3.05

3.32

4.29

-0.38

0.77

-2.98

2.22

-12

41

19.12

1.24

0.42

-1.79

4.28

3.90

-0.19

0.89

-2.88

2.50

-11

41

18.32

0.03

0.98

-2.82

2.88

3.98

0.02

0.99

-2.66

2.71

-10

41

16.00

-1.97

0.22

-5.12

1.18

5.32

1.67

0.27

-1.28

4.62

-9

41

16.63

-1.06

0.49

-4.08

1.95

6.63

3.07

0.03

0.32

5.81

-8

41

15.68

-3.76

0.02

-6.99

-0.53

5.98

2.96

0.03

0.36

5.56

-7

41

15.49

-3.84

0.02

-7.02

-0.66

3.63

0.59

0.63

-1.81

2.99

-6

41

17.27

-1.90

0.21

-4.90

1.09

4.49

1.31

0.32

-1.28

3.91

-5

41

15.63

-2.46

0.13

-5.63

0.72

4.73

1.32

0.33

-1.32

3.96

-4

41

14.20

-3.66

0.03

-7.02

-0.30

5.34

1.67

0.27

-1.27

4.62

-3

41

13.20

-2.85

0.08

-6.05

0.34

5.32

1.15

0.46

-1.87

4.17

-2

41

14.59

-2.70

0.12

-6.09

0.69

4.12

-0.04

0.98

-2.86

2.77

-1

41

14.80

-2.33

0.14

-5.38

0.73

4.63

1.03

0.48

-1.84

3.91

0

41

6.66

-11.27

0.00

-13.85

-8.69

2.78

-1.48

0.20

-3.74

0.78

1

41

7.76

-9.34

0.00

-12.21

-6.48

5.12

0.95

0.51

-1.88

3.78

2

41

9.44

-8.37

0.00

-11.32

-5.42

6.32

2.22

0.11

-0.52

4.96

3

41

11.90

-4.65

0.00

-7.74

-1.56

7.68

3.68

0.01

0.86

6.51

4

41

12.56

-4.37

0.01

-7.55

-1.19

6.93

2.80

0.04

0.10

5.49

5

41

12.78

-4.21

0.02

-7.64

-0.79

5.49

0.98

0.49

-1.82

3.78

6\3

40

14.90

-2.44

0.11

-5.47

0.58

4.65

0.44

0.76

-2.36

3.24

7

40

15.73

-0.99

0.54

-4.16

2.18

3.38

-1.72

0.24

-4.58

1.14

8

40

15.95

-0.58

0.72

-3.73

2.57

2.93

-2.18

0.12

-4.95

0.59

9

40

15.28

-1.00

0.56

-4.35

2.34

3.83

-1.52

0.31

-4.44

1.39

10

40

16.75

0.35

0.83

-2.86

3.55

3.28

-1.65

0.26

-4.50

1.19

11

40

14.48

-1.90

0.27

-5.29

1.48

4.65

-0.77

0.61

-3.75

2.20

12

40

15.18

-1.10

0.49

-4.22

2.02

5.40

-0.25

0.86

-3.16

2.65


1/ IG = index group, and CG = matching comparison group. The estimated mean difference is the bias-adjusted sample average treatment effect on the treated using nearest the neighbor matching estimator nnmatch in Stata 10, with 4 comparison workers matched to each index worker based on age, months of work experience, and gang.

2/ p-value for a z-test that mean difference = 0. 95% CI LL and UL are the lower and upper levels of the 95% confidence interval for the estimated average treatment effect on the treated.

3/ One index worker retired at the end of month 5.

Larson et al. BMC Public Health 2009 9:240   doi:10.1186/1471-2458-9-240

Open Data