condition mean min max ZT0-3 3.8129774999999997 3.24868 4.377275 ZT4-7 4.41687 4.41687 4.41687 ZT8-11 4.54352 4.54352 4.54352 ZT12-15 4.565734166666667 3.802345 5.329123333333333 ZT16-19 5.24608 3.8701600000000003 6.622 ZT20-23 0 0 0