condition mean min max ZT0-3 0.551027 0.551027 0.551027 ZT4-7 0.2323175 0.2323175 0.2323175 ZT8-11 0.19493074999999999 0.19493074999999999 0.19493074999999999 ZT12-15 0.5923245 0.5923245 0.5923245 ZT16-19 1.179315 1.179315 1.179315 ZT20-23 0.479748 0.479748 0.479748