condition mean min max ZT0-3 350.079147 350.079147 350.079147 ZT4-7 524.9707774999999 524.9707774999999 524.9707774999999 ZT8-11 607.0957490000001 607.0957490000001 607.0957490000001 ZT12-15 530.05186 530.05186 530.05186 ZT16-19 422.8151275 422.8151275 422.8151275 ZT20-23 365.4951705 365.4951705 365.4951705