condition mean min max ZT0-3 27.408225 26.3962 28.420250000000003 ZT4-7 38.93655 38.93655 38.93655 ZT8-11 40.301 40.301 40.301 ZT12-15 0 0 0 ZT16-19 54.0557 54.0557 54.0557 ZT20-23 46.4543 46.4543 46.4543