condition mean min max ZT0-3 115.84291 115.84291 115.84291 ZT4-7 129.90023 129.90023 129.90023 ZT8-11 134.60094850000002 134.60094850000002 134.60094850000002 ZT12-15 132.348428 132.348428 132.348428 ZT16-19 127.90012200000001 127.90012200000001 127.90012200000001 ZT20-23 146.14563950000002 146.14563950000002 146.14563950000002