condition mean min max ZT0-3 0.396586 0.22991450000000002 0.5632575 ZT4-7 1.45463 1.45463 1.45463 ZT8-11 0.6946135 0.6946135 0.6946135 ZT12-15 0 0 0 ZT16-19 1.638685 1.638685 1.638685 ZT20-23 1.0209405 1.0209405 1.0209405