condition mean min max ZT0-3 189.818528 189.818528 189.818528 ZT4-7 153.904984 153.904984 153.904984 ZT8-11 210.5289185 210.5289185 210.5289185 ZT12-15 202.05667749999998 202.05667749999998 202.05667749999998 ZT16-19 280.011853 280.011853 280.011853 ZT20-23 277.4842585 277.4842585 277.4842585