condition mean min max ZT0-3 1.7042925 1.23785 2.170735 ZT4-7 1.6491 1.6491 1.6491 ZT8-11 1.36741 1.36741 1.36741 ZT12-15 0 0 0 ZT16-19 1.51722 1.51722 1.51722 ZT20-23 1.62076 1.62076 1.62076