Table 2

Mean (O-E)/N for hospital surfactant use and death

Hospital

Surfactant use

Mean (95% CI)

p-value

Death

Mean (95% CI)

p-value

A

0.102 (0.082,0.122)

<0.001*

-0.130 (-0.166,-0.092)

<0.001*

B

0.196 (0.079,0.308)

0.010

0.011 (-0.004, 0.026)

0.219

C

0.131 (0.088,0.173)

<0.001*

0.003 (-0.006,0.012)

0.573

D

0.118 (0.065,0.172)

<0.001*

-0.004 (-0.014,0.006)

0.496

E

0.030 (-0.020,0.082)

0.312

0.00 (-0.012,0.011)

0.999

F

0.048 (0.026,0.071)

<0.001*

-0.017 (-0.021,-0.013)

<0.001*

G

0.043 (-0.031,0.114)

0.319

0.004 (-0.009,0.017)

0.534

H

0.027 (-0.086,0.137)

0.700

-0.005 (-0.024,0.015)

0.712

I

0.013 (-0.038,0.064)

0.659

-0.009 (-0.018,0.001)

0.129

J

-0.035 (-0.087,0.016)

0.265

0.013 (0.004,0.022)

0.001*

K

-0.065 (-0.113,-0.018)

0.020

-0.001 (-0.010,0.008)

0.845

L

-0.117 (-0.177,-0.057)

0.001*

0.002 (-0.008,0.011)

0.771

M

-0.164 (-0.240,-0.087)

<0.001*

0.006 (-0.010,0.022)

0.536

N

-0.192 (-0.269,-0.111)

<0.001*

0.008 (-0.006,0.023)

0.472

O

-0.298 (-0.337,-0.258)

<0.001*

0.033 (0.023,0.044)

<0.001*

P

-0.350 (-0.436,-0.260)

<0.001*

0.027 (0.004,0.051)

0.041

*significant with p ≤ 0.05 after Bonferoni correction (p ≤ 0.05/16 = 0.003)

Kaplan et al. BMC Health Services Research 2011 11:22   doi:10.1186/1472-6963-11-22