condition mean min max ZT0-3 4.685365 4.685365 4.685365 ZT4-7 8.882010000000001 8.882010000000001 8.882010000000001 ZT8-11 2.89832 2.89832 2.89832 ZT12-15 7.93624 7.93624 7.93624 ZT16-19 9.46171 9.46171 9.46171 ZT20-23 5.606935 5.606935 5.606935