condition mean min max ZT0-3 1.03232725 0.6823345000000001 1.38232 ZT4-7 1.6317705 1.6317705 1.6317705 ZT8-11 1.384115 1.384115 1.384115 ZT12-15 0 0 0 ZT16-19 0.7645735 0.7645735 0.7645735 ZT20-23 1.622945 1.622945 1.622945