condition mean min max ZT0-3 3.137245 3.010985 3.2635050000000003 ZT4-7 4.53115 4.53115 4.53115 ZT8-11 11.9054 11.9054 11.9054 ZT12-15 0 0 0 ZT16-19 8.280265 8.280265 8.280265 ZT20-23 3.4981999999999998 3.4981999999999998 3.4981999999999998