Infant characteristics in each study group (SD)
| Period | n | Male (%) | Mean birth weight (SD) | Mean gestational age (SD) | Mean CRIB II (SD), n |
| A. Preimplementation period (January 2011 to July 2011) | 52 | 23 (44.2) | 1.084 (0.270) | 29.2 (2.6) | 7.0 (3.6), 30 |
| B. Partial implementation period (August to December 2011) | 36 | 18 (50) | 1.029 (0.311) | 29.2 (2.9) | 6.4 (3.9), 20 |
| C. Main intervention period (January to December 2012) | 75 | 37 (49.3) | 0.998 (0.269) | 28.7 (3.0) | 6.9 (2.5), 44 |
| D. Postimplementation period (January to June 2013) | 35 | 22 (62.9) | 0.924 (0.261) | 28.1 (2.8) | 9.7 (3.2), 18 |
| p Value for difference between groups (ANOVA) | 0.392* | 0.066 | 0.290 | 0.008 |
*p value is for χ2.