condition mean min max ZT0-3 0.884402 0.884402 0.884402 ZT4-7 0.4686465 0.4686465 0.4686465 ZT8-11 0.481816 0.481816 0.481816 ZT12-15 0.608711 0.608711 0.608711 ZT16-19 0.9371974999999999 0.9371974999999999 0.9371974999999999 ZT20-23 0.5654645 0.5654645 0.5654645