condition mean min max ZT0-3 313.323628 313.323628 313.323628 ZT4-7 380.909216 380.909216 380.909216 ZT8-11 346.653829 346.653829 346.653829 ZT12-15 396.6532205 396.6532205 396.6532205 ZT16-19 336.1768305 336.1768305 336.1768305 ZT20-23 336.69519049999997 336.69519049999997 336.69519049999997