TABLE 2

The Quality of the Match

Medicaid Patients N = 17 739Non-Medicaid Patients N = 17 739Standardized Difference After MatchP After Match
Mean age, y7.27.2−0.02.29
Sex, N (% female)6578 (37.1)6639 (37.4)−0.01.51
Moderate presentation, N (%)13 216 (74.5)13 216 (74.5)0.00>.99
Severe presentation, N (%)3628 (20.5)3628 (20.5)0.00>.99
Critical presentation, N (%)895 (5.1)895 (5.1)0.00>.99
Mean predicted LOS1.91.9−0.01.36
Mean propensity score in probability units0.60.60.01.09
Comorbidities
 Any chronic disease, N (%)1142 (6.4)1180 (6.7)−0.01.43
 Acute URI, N (%)3185 (18.0)3254 (18.3)−0.01.35
 Pneumonia, N (%)1465 (8.3)1511 (8.5)−0.01.39
 Viral infection, N (%)2388 (13.5)2445 (13.8)−0.01.39
 Dehydration, N (%)722 (4.1)770 (4.3)−0.01.21
 Obesity, N (%)515 (2.9)527 (3.0)0.00.73
 GE reflux, N (%)427 (2.4)467 (2.6)−0.01.19
 Obstructive sleep apnea, N (%)131 (0.7)135 (0.8)0.00.85
 Sinusitis, N (%)146 (0.8)181 (1.0)−0.02.06
  • No differences in matching variables were statistically significant after the match. Standardized difference is the difference in means in units of SDs. P values were calculated using 2-sample balance tests: Fisher exact for categorical variables and Wilcoxon rank sum for continuous variables. GE, gastroesophageal; URI, upper respiratory infection.