condition mean min max ZT0-3 5.15879 5.15879 5.15879 ZT4-7 3.62251 3.62251 3.62251 ZT8-11 2.366445 2.366445 2.366445 ZT12-15 3.579565 3.579565 3.579565 ZT16-19 5.723694999999999 5.723694999999999 5.723694999999999 ZT20-23 6.45119 6.45119 6.45119