condition mean min max ZT0-3 107.875904 107.875904 107.875904 ZT4-7 126.1155815 126.1155815 126.1155815 ZT8-11 142.272438 142.272438 142.272438 ZT12-15 169.423748 169.423748 169.423748 ZT16-19 235.358589 235.358589 235.358589 ZT20-23 197.105785 197.105785 197.105785