condition mean min max ZT0-3 10.026407 10.026407 10.026407 ZT4-7 10.201216500000001 10.201216500000001 10.201216500000001 ZT8-11 8.945606 8.945606 8.945606 ZT12-15 9.621065 9.621065 9.621065 ZT16-19 10.2659845 10.2659845 10.2659845 ZT20-23 10.422216500000001 10.422216500000001 10.422216500000001