condition mean min max ZT0-3 191.395652 191.395652 191.395652 ZT4-7 197.2767525 197.2767525 197.2767525 ZT8-11 185.3346435 185.3346435 185.3346435 ZT12-15 184.495786 184.495786 184.495786 ZT16-19 189.13919850000002 189.13919850000002 189.13919850000002 ZT20-23 171.267683 171.267683 171.267683