condition mean min max ZT0-3 288.454981 288.454981 288.454981 ZT4-7 202.6444875 202.6444875 202.6444875 ZT8-11 252.1166725 252.1166725 252.1166725 ZT12-15 319.27385749999996 319.27385749999996 319.27385749999996 ZT16-19 383.16096749999997 383.16096749999997 383.16096749999997 ZT20-23 376.47158249999995 376.47158249999995 376.47158249999995