condition mean min max ZT0-3 3850.637574 3850.637574 3850.637574 ZT4-7 3392.197994 3392.197994 3392.197994 ZT8-11 3258.2446195 3258.2446195 3258.2446195 ZT12-15 3921.8992344999997 3921.8992344999997 3921.8992344999997 ZT16-19 3980.2843775 3980.2843775 3980.2843775 ZT20-23 3527.9323185000003 3527.9323185000003 3527.9323185000003