condition mean min max ZT0-3 44.355651 44.355651 44.355651 ZT4-7 94.68384 94.68384 94.68384 ZT8-11 148.81887 148.81887 148.81887 ZT12-15 143.679971 143.679971 143.679971 ZT16-19 508.4289865 508.4289865 508.4289865 ZT20-23 267.6670175 267.6670175 267.6670175