Table 1.

Baseline and Surveillance Characteristics of Child-periods of Observation According to the Intervention Group*

CharacteristicZinc GroupControl Group
Age at beginning of period (mo)18.6 ± 8.518.6 ± 8.7
 6–11 mo (% of child-periods)24.625.7
 12–23 mo46.347.3
 >23 mo29.126.9
Nutritional status
 Normal (%)32.831.5
 Stunted52.651.4
 Wasted3.13.9
 Wasted and stunted11.512.9
Baseline plasma zinc (μg/dL) 64.3 ± 14.464.1 ± 19.1
Males (% of child-periods)51.451.7
Surveillance information
 Children   297   306
 Child-periods  1633  1663
 Days of surveillance45 01945 768
 Days with cough  9121  8090
 RR measurements  1985  1801
 Number of episodes/child
  0   274   263
  1    22    42
  2     1     1
  • Abbreviation: RR, respiratory rate.

  • * Plus-minus values are means ± SD.

  • Stunting and wasting were defined as < −2.0 zscores for height for age and weight for height, respectively, using the National Center for Health Statistics reference population.24

  • To convert zinc concentration to micromoles per liter, multiply by 0.153.