TABLE 2.

T:N values for urine samples stored at 4 and −70°C

Urine sampleT:N value for urine sample at:
Time zero1 mo2 mo3 mo6 mo
4°C−70°C4°C−70°C4°C−70°C4°C−70°C
14.83.33.915.294.514.83.153.23.7
22.53.511.624.62.493.91.751a2.9
35.64.844.535.316.055.85.4756.8
45.033.382.833.163.782.92.53.53.2
55.84.213.855.114.536.44.61.74.0
66.73.464.25.216.184.74.975.0
76.84.84.294.415.676.043.356.5
83.12.472.123.682.742.81.54.27.5
95.94.684.696.016.365.75.97.59.2
106.24.64.575.896.116.86.030.7a2.1
114.83.243.294.424.474.53.50.9a1.4
123.62.842.393.64.233.32.16.57.0
133.091.921.762.52.662.31.80.6a1.9
142.52.52.593.152.432.233.122.53.4
156.036.038.51.215.370.758.90.6a3.3
167.477.477.194.135.24.077.724.28.2
Median5.003.953.904.234.554.194.143.384.76
SD1.461.421.731.311.211.652.091.852.35
  • a Sample tested negative after being stored for 6 months at 4°C.