Baseline Characteristics of the 251 Prevalent DSP Cases and the 107 Prevalent Controls According to the 4-Year Incidence of DSP.

Data are means ± standard deviations or n (%). For comparisons between two groups, p values reported are χ2 test statistics for categorical variables and T-tests for continuous variables. For comparisons between three groups, p values reported are χ2 test statistics for categorical variables and ANOVA for continuous variables. Normal values for individual NCS are as follows. Sural amp≥7.2 µV for age ≤65 and ≥5.5 µV for age >65, sural CV≥40 m/s, peroneal amp≥5 µV for age ≤65 and ≥3 for age >65, peroneal CV≥40 m/s, peroneal F wave ≤59 ms for height ≥182.9 cm and ≤58 ms for height ≤182.9 cm, tibial amp≥10 µV, tibial CV≥40 m/s, tibial F wave ≤55 ms.*p-value for ANOVA between Prevalent Cases, Incident DSP Cases and Incident DSP Controls.†By subject self-report.‡HbA1C, glycated hemoglobin A1C.§Summative parameters are composed of the following: sum amplitude = sural+tibial, sum conduction velocity = sural+peroneal +tibial, sum F-wave latency = peroneal+tibial.¶Summed amplitude potentials are expressed in arbitrary units since sural amplitude potential is measured in microvolts and tibial amplitude potential is measured in millivolts.∥Statistical tests for the NCS parameters applied a Bonferroni correction for multiple comparisons for significance such that p-values TCNS, Toronto Clinical Neuropathy Score. Amp, amplitude potential. CV, conduction velocity. F-wave, F-wave latency.

数据以均值±标准差或例数（百分比）的形式呈现。
两组间比较时，报告的p值针对分类变量采用卡方（χ²）检验统计量，针对连续变量采用t检验。
三组间比较时，报告的p值针对分类变量采用卡方检验统计量，针对连续变量采用方差分析（ANOVA）。
各项神经传导检查（Nerve Conduction Study, NCS）的正常参考值如下：腓肠神经振幅（amp）≥7.2 μV（年龄≤65岁者）、≥5.5 μV（年龄>65岁者）；腓肠神经传导速度（CV）≥40 m/s；腓总神经振幅≥5 μV（年龄≤65岁者）、≥3 μV（年龄>65岁者）；腓总神经传导速度≥40 m/s；腓总神经F波（F-wave）潜伏期≤59 ms（身高≥182.9 cm者）、≤58 ms（身高≤182.9 cm者）；胫神经振幅≥10 μV，胫神经传导速度≥40 m/s，胫神经F波潜伏期≤55 ms。
* 针对普发病例、新发DSP病例与新发DSP对照者的方差分析p值。
† 由受试者自行报告。
‡ 糖化血红蛋白A1C（glycated hemoglobin A1C, HbA1C）。
§ 综合参数由以下部分构成：总振幅=腓肠神经振幅+胫神经振幅，总传导速度=腓肠神经传导速度+腓总神经传导速度+胫神经传导速度，总F波潜伏期=腓总神经F波潜伏期+胫神经F波潜伏期。
¶ 由于腓肠神经振幅电位以微伏（μV）为单位、胫神经振幅电位以毫伏（mV）为单位，故合并后的振幅电位以任意单位表示。
∥ 针对神经传导检查参数的统计学检验采用邦费罗尼校正以进行多重比较的显著性检验。相关术语缩写如下：TCNS为多伦多临床神经病评分（Toronto Clinical Neuropathy Score）；Amp为振幅电位（amplitude potential）；CV为传导速度（conduction velocity）；F-wave为F波潜伏期（F-wave latency）。