condition mean min max ZT0-3 10.487883 10.487883 10.487883 ZT4-7 12.519893 12.519893 12.519893 ZT8-11 12.2122025 12.2122025 12.2122025 ZT12-15 14.1560265 14.1560265 14.1560265 ZT16-19 12.9116565 12.9116565 12.9116565 ZT20-23 10.828890000000001 10.828890000000001 10.828890000000001