condition mean min max ZT0-3 174.30898 174.30898 174.30898 ZT4-7 308.83606100000003 308.83606100000003 308.83606100000003 ZT8-11 277.259065 277.259065 277.259065 ZT12-15 286.818772 286.818772 286.818772 ZT16-19 256.636502 256.636502 256.636502 ZT20-23 224.35799049999997 224.35799049999997 224.35799049999997