リストに追加されないデータ　python

前提・実現したいこと

下記のコードを書きました。
しかし、なぜかstdv_Cpだけが何もないファイルが出力されます。
その他の平均、最大値、最小値は出力されているのですが
なぜこんなことがおきるのですか？

尚、cp_remove_lstは3000行309列のデータです。

該当のソースコード

statistic = []
mean_Cp = np.mean(cp_remove_lst,0) 
stdv_Cp = np.std(cp_remove_lst,0)
max_Cp = np.max(cp_remove_lst,0)
min_Cp = np.min(cp_remove_lst,0)

statistic += [mean_Cp, stdv_Cp, max_Cp, min_Cp]
statistic_with_label = pd.DataFrame(statistic, columns = header_probe, index = index_statisitcs)
statistic_with_label.to_csv('cp_statistic.csv', header=True, index=True, float_format='%.8f')

cp_statistic.csv（本来は4行309列のデータ、今は字数制限のため）

ここに問題に対して試したことを記載してください。

,probe1,probe2,probe3,probe4,probe5,probe6,probe7,probe8,probe9,probe10,probe11,probe12,probe13,probe14,probe15,probe16,probe17,probe18,probe19,probe20
ave,-0.48426667,-0.45623333,-0.50583333,-0.60376667,-0.61413333,-0.63286667,-0.64523333,0.14686333,0.37383333,0.55433333,0.6367,0.61373333,0.4073,0.14936667,-0.69416667,-0.72303333,-0.67103333,-0.53223333,-0.45603333,-0.40296667
rms,,,,,,,,,,,,,,,,,,,,
max,0.00079443,0.0084507,-0.12238,-0.21261,-0.18114,-0.19689,-0.19429,0.59851,0.93338,1.1148,1.1711,1.0244,0.77834,0.52742,-0.083574,-0.080499,-0.097397,-0.016492,-0.010448,0.029793
min,-1.5555,-1.0793,-1.0828,-1.6755,-1.2882,-1.1672,-1.3542,-0.24961,-0.025646,0.11112,0.17411,0.16979,0.00007081,-0.23024,-1.9209,-2.1275,-1.7796,-1.2985,-1.0629,-1.2129

cp_remove_lst.csvの最初の2行

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