condition mean min max ZT0-3 2.3356 2.3356 2.3356 ZT4-7 2.890745 2.890745 2.890745 ZT8-11 1.534235 1.534235 1.534235 ZT12-15 1.956245 1.956245 1.956245 ZT16-19 2.049235 2.049235 2.049235 ZT20-23 1.98624 1.98624 1.98624