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Table 2 Association between urine melamine level and daily milk consumption.

From: Hong Kong Chinese school children with elevated urine melamine levels: A prospective follow up study

  Drinking more than a cup of milk per day #  
  No (n = 378) Yes (n = 99) p-value
Urine melamine (μg/l) § 6.0 (0 - 25.0) 11.0 (0 - 33.0) 0.280 a
Urine melamine/creatinine ratio (μg/mmol) 0.62 (0 - 2.33) 1.00 (0 - 3.19) 0.182 a
Elevated urine melamine level (melamine/creatinine ratio >7.1 μg/mmol) ψ    
   No 347 (91.8%) 85 (85.9%) 0.072 b
   Yes 31 (8.2%) 14 (14.1%)  
  1. Data marked ψ are presented as frequencies (percentages), all others are medians (interquartile ranges).
  2. # There were 25 subjects with missing milk consumption data.
  3. §Undetectable urine melamine level was set to zero.
  4. a Mann-Whitney test; b Pearson Chi square test.