那篇研究冻脚后感冒的文章，全文见：
http://fampra.oxfordjournals.org/cgi/reprint/22/6/608感冒症状分四级评分，0=没有，1=轻度，2=中度，3=重度。80多个人评分然后算平均值和标准差。有没有可能算出1.93±2.83这个值？
我算了一下，87个人，31个人评0分，56个人评3分，这样分布的标准差应该是最大值，结果是1.93±1.45。
All subjects were asked if they were suffering with a
cold and to score symptoms of runny nose, blocked
nose, sore throat, sneezing and cough on a scale of
0–3 with 0 = not present, 1 = mild, 2 = moderate, 3 =
severe before and immediately after the procedure. The
same common cold question and symptom scores were
also used in a daily diary. The method of symptom
scores has been widely used in previous studies on common
cold.12,13 All subjects were provided with a diary,
in which they were instructed to score symptoms and at
the same time to indicate if they believed they were
suffering from a common cold (day 1 PM, days 2 and
3 AM/PM, day 4 AM, and on visit two which occurred
on day 4 or 5).
TABLE 3 Delayed effects of chilling
Day 1 Day 2 Day 3 Day 4/5 Total
Control (n = 88)
mean score
0.32(0.70) 0.73(1.11) 0.48(0.77) 1.36(1.95) 2.89(3.39)
Chill (n = 87)
mean score
0.57(1.12) 1.38(1.84) 1.28(1.48) 1.93(2.83) 5.16(5.63)
Figures are mean (standard deviation) of daily symptom scores and total scores for days 1–4/5 following each procedure.
Comparison of total symptom scores P = 0.013