condition mean min max ZT0-3 3598.972595 3598.972595 3598.972595 ZT4-7 3176.7459035 3176.7459035 3176.7459035 ZT8-11 3187.61086 3187.61086 3187.61086 ZT12-15 3525.3756519999997 3525.3756519999997 3525.3756519999997 ZT16-19 3657.2673775000003 3657.2673775000003 3657.2673775000003 ZT20-23 2304.462875 2304.462875 2304.462875