condition mean min max ZT0-3 13.094689 13.094689 13.094689 ZT4-7 25.774436 25.774436 25.774436 ZT8-11 29.602176 29.602176 29.602176 ZT12-15 23.585971999999998 23.585971999999998 23.585971999999998 ZT16-19 29.2259045 29.2259045 29.2259045 ZT20-23 31.1116375 31.1116375 31.1116375